FAQ

Why can't I just call anyone by phone number?

T9phone is a closed-group calling system, not a phone carrier. There are no public numbers. You can only ring people who share at least one group with you.

What is a dial code?

Your dial code is your nickname typed on a phone keypad. gandalf becomes 4263253. Others in your group press those digits to ring you.

Can two people have the same dial code?

Not inside the same group — T9phone refuses to add a second person whose nickname maps to the same digits. Across different groups it's fine. If you call a code that resolves to two different people across your groups, T9phone refuses to guess; use *N*<code> prefix dialing or set a default group on the dashboard.

How do I add someone to a group?

Open /groups, expand the group, send them an invite by email or share a generated link. If they don't have an account yet, the invite link doubles as a one-step signup.

Why does the invite say it was issued to a different email address?

Email-addressed invites are bound to the recipient's email. You are probably signed in under another account. The Accept page now shows a "Sign out & accept as …" button to switch.

Are calls encrypted?

SIP signalling runs over TLS. Audio uses SRTP between your phone and the relay; when ICE finds a direct peer-to-peer path the audio doesn't touch the relay at all.

Does T9phone record calls?

No. The server never stores call audio.

What user data is stored?

Only what is strictly necessary: your email, a bcrypt password hash, your nickname, SIP credentials (password stored AES-256-GCM encrypted), group memberships, and temporary tokens for email verification and password reset. No call records, no IP addresses, no device info, no presence data. Full breakdown at t9phone.com/data.

I changed my nickname. What happens to people who saved my old dial code?

The old dial code stops resolving immediately. The new one is live as soon as the change is saved. Tell people the new nickname (the dashboard shows the new digits next to it).

Why was my invite refused as "exhausted"?

Invites have a usage counter. A single-use invite is consumed by the first successful redemption. Owners can mint multi-use invites by raising the uses field when sending one.