CompleteSMS review
CompleteSMS suits an Australian business that wants fixed monthly SMS allowances with per segment overage and unlimited account users. Plans run from $29.00 AUD excluding GST a month for 400 up to larger tiers. The key limitation is contract terms, because the service agreement defers the Initial Term and renewal to an Account Details Addendum, so you should confirm your written account terms before committing.
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No overall score
One of 56 brands reviewed. Not in the priced comparison: Monthly plans have allowances, activation fees and optional sender costs.
- Five published monthly Australian plans from $29.00 AUD excluding GST a month for 400, with overage rates that fall as plan size rises.
- Unlimited users on monthly plans, so a team can share one account without per seat fees.
- Both an HTTPS JSON API and an SMTP email gateway, plus browser bulk sending, giving you several integration paths.
- No monthly allowance rollover is verified, so confirm in writing what happens to unused segments before committing.
- The service agreement names Red Oxygen Inc, its affiliates and subsidiaries as contracting parties, while the ABN 51 097 164 371 belongs to Red Oxygen Pty Limited, so the counterparty on your account needs confirmation.
- Dedicated numbers and sender IDs attract separate activation and monthly fees on top of plan pricing.
CompleteSMS at a glance, checked 23 October 2026
What CompleteSMS publishes, read from its own pages, the Australian Business Register and ACMA's list. 5 of 7 facts are published; the rest say so. What each row measures.
| Fact | CompleteSMS | Read |
|---|---|---|
| Monthly pricing model | Plan fee plus overage. Use the monthly plan calculator. | |
| Lowest full-allowance average | 5.50c at full use of the Extra Large allowance of 18,000 segments for $990.00 a month excluding GST, before setup and optional fees | |
| Australian presence and published ABN | Tier 2, Registered AU entity. Published ABN 51 097 164 371 is registered to Red Oxygen Pty Limited. Service terms name Red Oxygen Inc, its affiliates and subsidiaries as operator | |
| Support as published | Australian phone on 1800 770 758, live chat and support tickets. Support hours were not verified. | |
| Sending methods published | Web app, API and email to SMS | |
| Two-way SMS and MMS | Two-way yes, MMS not published | |
| Editorial score | Not scored by this site |
CompleteSMS has a lowest full-allowance average of 5.50c at full use of the Extra Large allowance of 18,000 segments for $990.00 a month excluding GST, before setup and optional fees, is a tier 2 provider whose website publishes ABN 51 097 164 371, registered to Red Oxygen Pty Limited, and offers support via Australian phone on 1800 770 758, live chat and support tickets. Support hours were not verified.
Where CompleteSMS stands
CompleteSMS suits an Australian business that wants fixed monthly SMS allowances with per segment overage and unlimited account users. Plans run from $29.00 AUD excluding GST a month for 400 up to larger tiers. The key limitation is contract terms, because the service agreement defers the Initial Term and renewal to an Account Details Addendum, so you should confirm your written account terms before committing.
Australian presence: tier 2, Registered AU entity. Red Oxygen Pty Limited is registered in Australia and CompleteSMS lists an office in Spring Hill, Queensland. Confirm the contracting entity in the account details.
What CompleteSMS offers Australian senders
| API | Yes |
|---|---|
| Email to SMS | Yes |
| Two-way SMS | Yes |
| Dedicated number | Yes |
| Alphanumeric sender ID | Yes |
Nothing published either way on SMPP, MMS, RCS or Shared number.
How CompleteSMS prices
CompleteSMS monthly plans start at $29.00 for 400 SMS segments. Account setup is $20.00. All figures are AUD excluding GST. Overage and optional sender fees are additional.
The table shows the published Australian monthly plans with their included SMS segments and overage cents per extra segment. Each account activation carries a $20.00 AUD excluding GST charge applied in the first month only. The calculator combines your expected volume with the plan fee, overage and first month setup so you can compare documented plans. Optional dedicated numbers and sender IDs are excluded, as are negotiated quotes.
CompleteSMS monthly SMS plans
This monthly SMS plan comparison covers 5 published plans across 1 Australian-eligible providers. It is an A to Z listing, not a ranking. Each entry shows the monthly fee, included SMS segments and the excess segment charge. This subset is separately documented and does not cover every monthly plan on the market. First-month account setup can change the total cost. Source dates are shown per provider.
| Provider and plan | Monthly fee | Included segments | Overage per segment | Account setup | Ongoing month | First month | Unused allowance |
|---|---|---|---|---|---|---|---|
| CompleteSMSExtra Small | $29.00 | 400 | 7.3c | $20.00 | $72.80 | $92.80 | 0 |
| CompleteSMSSmall | $109.00 | 1,600 | 6.8c | $20.00 | $109.00 | $129.00 | 600 |
| CompleteSMSMedium | $249.00 | 3,800 | 6.6c | $20.00 | $249.00 | $269.00 | 2,800 |
| CompleteSMSLarge | $496.00 | 8,000 | 6.2c | $20.00 | $496.00 | $516.00 | 7,000 |
| CompleteSMSExtra Large | $990.00 | 18,000 | 5.5c | $20.00 | $990.00 | $1,010.00 | 17,000 |
The calculator adds the fixed monthly fee to overage charges once the allowance is used. The first-month scenario includes the documented one-time account setup fee, including zero where no upfront costs are published. All figures are in AUD excluding GST. It excludes optional dedicated numbers, sender ID fees, forwarding and negotiated quotes. Unused included messages are shown, though no rollover is assumed. Enter billable SMS segments, not contact counts. See the SMS segment counter for details.
For irregular campaigns, prepaid can differ from monthly subscriptions. Do not infer monthly volume rates from prepaid packages. Check number fees, expiry, cancellation and written account terms before you commit. See our SMS Papa review and GoFax review for provider detail, plus our email to SMS providers and SMS API comparison guides. No single provider is cheaper or best for every business, so compare the terms that apply to your own sending.
What CompleteSMS is
CompleteSMS is a Red Oxygen solution introduced in 2025. The Australian entity behind it is Red Oxygen Pty Limited, ABN 51 097 164 371, active since 15 January 2001 and registered in Queensland postcode 4000, with CompleteSMS registered as a business name from 6 December 2025. An Australian office operates from Spring Hill QLD on 1800 770 758, alongside global offices. One point needs care. The service agreement dated July 2025, published on the provider website, names Red Oxygen Inc, its affiliates and subsidiaries as contracting parties, together with an Account Details Addendum. The ABN alone does not prove which entity signs your contract, so check the counterparty on your account details.
Monthly pricing
The published Australian monthly plan prices are billed in AUD plus GST and apply to messages sent to Australian numbers. Plans scale from $29.00 AUD excluding GST a month for 400 through to larger tiers, with overage cents per extra segment falling as the plan size rises. Each account activation carries a $20.00 AUD excluding GST charge, applied once. Monthly plans include unlimited users. Optional dedicated numbers cost $29 a month plus $29 activation on the Australian monthly table. Confirm GST on this optional number line, and custom sender IDs carry a per SMS surcharge with a registration fee and a monthly fee, all excluded from the calculator. The tax treatment of optional numbers needs confirmation when quoting. Prepaid bundles exist separately with GST included pricing and 365 day credit expiry, marketed as twelve months. No monthly rollover is verified. Marketing states no contract and free cancellation at any time, but the service agreement sets the Initial Term and renewal in the Account Details Addendum, so rely on your written account terms rather than an unqualified cancellation promise. Plan details are published on the provider pricing page under the Australia monthly heading.
Setup and sending options
You can send through the browser in bulk, through the HTTPS API, or through the SMTP email gateway. For a broader SMS API comparison, our API gateway overview places these integration paths side by side. The HTTPS API is documented in the SMS API v1.1 specification linked from the provider resources page. A request carries a JSON Sender object with AccountId, Username as an email, and Password, posting to the send endpoint. Each request accepts up to 500 recipients, which is a per request cap rather than a throughput limit. Delivery receipts return to a Receipt Callback URL when you set ReceiptFlag to 1 or 2, with email fallback if the URL is null or fails. Replies work the same way through ReplyType H and a Reply Callback URL. A 15 day trial exists with limited whitelisted numbers under the trial terms.
The email gateway
The SMTP gateway suits teams that prefer email over code, and our email to SMS providers guide covers this pattern generally. Format 1 sends to a mobile address at the gateway domain, joins the subject and body, and truncates at 160 characters without long SMS support, a provider-documented limit. Format 3 sends to a fixed gateway address with X-Cellphone recipient rows in the email body, a blank line, then the message, allowing up to 765 characters, billed at 153 per part beyond the first 160, also as documented by the provider. A published SMS segment counter can help you estimate parts before sending. Authentication accepts a registered From address with your own static SMTP server IP, or an AccountID with a user password. Shared hosted email IPs are not suitable for identifying a single customer for IP authentication, so confirm a suitable method with the provider before relying on a hosted mailbox. Replies go back to the original sender by default. Outlook and Gmail addins are also available, which is separate from the SMTP format itself. For crafting message content within these limits, see our guide to writing SMS.
Reliability and limitations
No uptime claim was verified for this review. Credit expiry of 365 days applies to prepaid terms only. The 500 recipient cap and the Format 1 truncation are the main documented operational constraints. No hands on account or message testing took place, because this is a documentary review of provider sources read on 23 October 2026.
Support
Support runs through the Australian phone line plus live chat and ticket channels, as listed on the provider contact page. Business hours are not verified. No free inbound pricing is verified, so confirm inbound costs with the provider before porting or advertising a reply number.
Verdict
CompleteSMS fits an Australian business that wants documented monthly plans, unlimited users and both API and email sending paths. Confirm the contracting entity, the Initial Term in your Account Details Addendum, and the tax treatment of optional numbers before you sign. For a wider monthly SMS plan comparison, our Australian business SMS overview places these plans against alternatives, so you can weigh the documented tiers against your expected volume.
How much is CompleteSMS?
CompleteSMS monthly plans start at $29.00 for 400 SMS segments. Account setup is $20.00. All figures are AUD excluding GST. Overage and optional sender fees are additional.
Who operates CompleteSMS?
CompleteSMS's published sources identify Red Oxygen Inc, its affiliates and subsidiaries as the operator.
Is CompleteSMS good?
This site has not scored CompleteSMS.
What is CompleteSMS used for?
CompleteSMS is used for bulk and transactional SMS from a web app and SMS marketing campaigns, and it publishes email to SMS and two-way replies.
Similar providers to CompleteSMS
- Edgility · Pyrmont, Sydney, Australia
- IntelliSMS · Registered AU entity
- OneWaySMS · Registered AU entity
Compare CompleteSMS with another provider
| Measure | CompleteSMS | Cellcast |
|---|---|---|
| Dedicated number | Yes | Yes |
| Alpha sender ID | Yes | Yes |
| Email to SMS | Yes | Yes |
| Two way | Yes | Yes |
CompleteSMS questions
Can I send SMS by email without writing code?
Yes. The SMTP gateway accepts plain text email at registered addresses. Format 1 joins the subject and body and truncates at 160 characters, while Format 3 uses X-Cellphone recipient rows in the email body and allows up to 765 characters, billed in 153 character parts beyond the first 160. Authentication uses a registered From address with a static IP, or an AccountID with a user password.
How does the HTTPS API handle delivery and replies?
Each request accepts up to 500 recipients. You set a Receipt Callback URL with ReceiptFlag 1 or 2 for delivery notifications, and ReplyType H with a Reply Callback URL for inbound replies. If a callback URL is null or fails, both fall back to email. The SMS API v1.1 specification on the provider resources page sets out the request structure.
Who is behind CompleteSMS?
CompleteSMS is a Red Oxygen solution introduced in 2025. The Australian entity is Red Oxygen Pty Limited, ABN 51 097 164 371. Confirm the contracting entity on your quote or account details, because the service agreement names Red Oxygen Inc, its affiliates and subsidiaries.
Verification log
What was read, where and when (our method).
| Checked | Date read | What it said |
|---|---|---|
| Published rate card | The table shows the published Australian monthly plans with their included SMS segments and overage cents per extra segment. Each account activation carries a $20.00 AUD excluding GST charge applied in the first month only. The calculator combines your expected volume with the plan fee, overage and first month setup so you can compare documented plans. Optional dedicated numbers and sender IDs are excluded, as are negotiated quotes. | |
| Australian monthly plans and optional sender fees | ||
| ABN and registered CompleteSMS business name | ||
| Platform and Red Oxygen relationship | ||
| Account terms and prepaid expiry | ||
| Australian office and support | ||
| HTTPS API v1.1 | ||
| SMTP formats and authentication |