Thanks for wanting to join Sweatcoin!
When entering your mobile number, don't copy and paste it in, make sure you start with the “+” and country code (e.g. "+1" for the US and "+44" for the UK) followed by the number without any dashes, dots, spaces, etc. If you did this correctly and it still didn't arrive, give it some time.
We use technology from Twilio and Nexmo, who are the two best companies when it comes to delivering this SMS service. If you have tried a number of times (to your correct number)... it is not likely that we will be able to solve this easily, as there might be an issue on their end. Again give it some time and if you are still experiencing issues, contact us.