Why some apps reject some numbers

Sometimes a service refuses a number before it ever sends a code: "This phone number can't be used", "Invalid number", or a vague error. Here's what's usually going on.

The usual reasons#

• Number type. Every phone number is classified — mobile, landline, VoIP and so on — in numbering databases that services can query. Some services only accept numbers they classify as mobile. We don't promise that any number is classified a particular way.
• Number reputation. Services keep their own records of numbers they've seen. A number that's been used for sign-ups before may be refused even though it works perfectly.
• Country rules. Some services only accept numbers from certain countries, or from the country your account or connection appears to be in.
• Account-level checks. Some services weigh other signals — your device, network or account history — and may ask for a different number whichever number you use.

Each service decides for itself, changes its rules without notice, and rarely says why. That's why we can't guarantee that a particular service will accept a particular number.

What it costs you#

Nothing, as long as no SMS arrives. If the service refuses the number, cancel the order for a full refund — or leave it, and it expires and refunds itself after 20 minutes.

What to try#

1. Cancel and order again. You'll get a different number.
2. Try another country, or switch to the Best strategy to favour offers with higher success rates.
3. If the service needs a specific country, order in that country.