Check the country code
Local and international forms may look different. Do not infer a code only from the message language. Use a reliable source number and compare it with the format shown in the bot menu.
Remove accidental additions
Copying a contact card can include a name, label or extension. Separate the main number from extra information. Check the service requirements for spaces, brackets and the plus sign.
Do not guess digits
A partly hidden number is not a complete phone identifier. Do not treat a guess as a confirmed contact. This guide does not promise fragment-based phone search; check supported modes in the menu.