Mobile vs. VoIP numbers: a selection worksheet
Choose a receiving number by checking its classification, SMS capability and the destination service’s requirements. This worksheet keeps those three questions separate and gives you a useful test record.
Start with three questions
| Question | Evidence to collect |
|---|---|
| What is the reported line type? | Provider information and a current classification lookup |
| Can the number receive SMS? | Enabled capability plus an actual receipt test |
| Does the destination accept it? | The service's requirement and the intended verification step |
Scroll horizontally to see all columns.
Twilio's line-type documentation describes mobile, landline, fixed VoIP and non-fixed VoIP categories. A category is useful selection information. It does not replace testing the actual journey.
Capture where a check succeeds or fails
A service may reject a destination before sending. It may accept it but encounter a sending or delivery problem. A received code may then fail because it expired or belonged to a different request. Record the stage so the next action follows the evidence.
For company accounts, check the setup, login or recovery step you intend to depend on. For your own app, use the configured sender and environment the test is meant to cover.
Select for the work you need
- Own-application QA: choose an SMS-capable destination accepted by the application, then check actual delivery.
- A service with a mobile requirement: include mobile classification in the selection and confirm the exact service flow.
- Company account continuity: check ownership and teammate access along with the verification requirement.
Phonekit calls its SMS-capable US local option Standard, and its mobile-network option Mobile. Use Mobile for accounts that require a mobile-network number, and Standard where the service accepts that number type. Bring the country and intended flow when choosing a number. See plans and included numbers.
Keep a dated selection record
| Field | Your entry |
|---|---|
| Service / application | Name and environment |
| Destination | Number label and country |
| Reported classification | Type, source and lookup date |
| Flow | Setup, login, invitation or recovery |
| Service accepted destination | Yes / no, with stage |
| Message received | Yes / no, with receipt time |
| Verification completed | Yes / no, with outcome |
| Next action | Owner and follow-up |
Scroll horizontally to see all columns.
Repeat the relevant check when the destination, service requirement or sender configuration changes. This record makes a support conversation much more useful than “the number did not work.”
Questions you may have
Does non-VoIP mean guaranteed acceptance?
A mobile or non-VoIP classification can satisfy a stated line-type requirement. The service still makes its own acceptance and verification decisions. Confirm the intended flow rather than treating a classification as a universal guarantee.
Can a VoIP number receive verification SMS?
SMS capability and the destination service’s policy determine the answer for a particular flow. Some services accept a capable destination; others apply additional requirements. Use the worksheet to separate classification, acceptance and receipt.
What should we tell Phonekit before selecting a number?
Share the country, service or app, exact verification step and any documented line-type requirement. If you already tested a destination, include the failing stage and date. That lets us discuss the option relevant to your work.