Blog
Numbers, codes and the API — to the point
How to get a code, why it doesn't arrive, and how to move your software to another service.
- Telegram on a virtual number: sign-up step by stepHow to sign up for Telegram on a virtual number without a SIM card: what you need, how to get the code by SMS, and what to switch on right away so you don't lose the account.
- WhatsApp without a SIM card: sign up on a virtual numberHow to sign up for WhatsApp or WhatsApp Business on a virtual number without a SIM card: step by step, what to do about the timer, and how not to lose the account when you change phones.
- The code isn't arriving on a virtual number: 7 reasons and what to doWhy an SMS code doesn't arrive on a virtual number and what to do: code in the app or by call, number rejected, limits, a second code. And when the money comes back.
- A number for ChatGPT and Claude: passing the phone checkHow to confirm a phone at ChatGPT and Claude sign-up with a virtual number: why the country matters, step-by-step instructions, and what to do if the number is rejected.
- One-off activation or a rented number: which to chooseHow a one-off activation differs from renting a number: how long the number is yours, refunds, which services and countries. And how to pick for your task.
- SMS-Activate alternative: where to move your software and numbersSMS-Activate closed at the end of 2025. How to move registration software to RelySMS: the same protocol and codes, only the address and key change.
- DaisySMS alternative: US numbers for codes after the shutdownDaisySMS closed on 26 March 2026. Where to get US numbers for SMS codes now: one-off activations, VoIP and rentals, plus moving your software over the API.