We want to ensure people who register as tradespeople on the site have genuine telephone numbers so a mobile phone check is a standard part of our registration process. It's very important those who apply are genuine and have genuine contact details. Unfortunately, those who are not prepared to confirm their telephone number will be unable to join and will not pass the vetting stages of registration as tradespeople on Top Tradespeople. Additionally, since Top Tradespeople only operates in the UK, only mobile phone numbers registered in the UK will be accepted.