If you did not receive an SMS with a code when registering from Telegram, Instagram, WhatsApp or other applications, there are several actions you can take:
1. Check the correctness of the entered phone number. Make sure that you entered your number correctly and indicated the country code and operator correctly.
2. Try resending the SMS with the verification code. Usually, the app has a button "Resend code" or something similar. Click on this button and wait for the new message to be delivered.
3. Check your internet signal status. Make sure you have a stable internet connection. Poor network quality can cause delays in receiving SMS.
4. Use alternative verification methods. Some messengers offer alternative verification methods, such as calling with a verification code or using an email address. Check the availability of such options in the application where the difficulties occurred.
5. If none of the previous options helped, contact the app's support team with the problem. They will be able to check the account and help resolve the problem with receiving SMS messages.
The main thing in the issue of receiving SMS with a code from third-party applications, messengers is to use official versions of applications. In case of using unofficial versions of applications, errors may occur.