Why has my mobile phone verification code not come through?

Why has my mobile phone verification code not come through?

Firstly, please ensure your mobile number is correct, if it isn’t correct, or you have used a landline number instead of a mobile number, then please change your number by clicking the ‘wrong number?’ button.
If you have used a mobile number and it is correct then please click on the ‘resend code’ option ensuring your mobile has signal, if your verification code has not come through within 5 minutes then please call the Squad in Touch support team using the number you signed up with.