1. Please ensure you enter your phone number in international format with the country code. Example: +291 717xx93, +251 96xxx0088 You don't need to type "+" - it is added automatically. No 0 or 00 or 011 after or before the country code unless it is the part of your number. If it doesn't help, please send us your phone number and we will try to help! 2. If the validation message doesn't come, please wait for a validation call or try again. 3. Some VoIP services may be blocked by Internet providers in some Countries. To make sure Easycalls App calls are not blocked just try to open kodatelcalls.com in your mobile web browser. If you can't open it, try using some other Internet connection.