Usually if a phone number is invalid it may be because the form of the telephone number is incorrect, or you are adding an international phone number that we don’t recognise.
Make sure you’ve included your full phone number and only used numbers.
If you’re using an international phone number you will need to look up the country calling code for your landline or mobile phone number. Add a + symbol and the country calling code to the start of your phone number and drop the first digit of your number.
For example the country calling code for France is 33 and you would enter the phone number as below:
Phone number: 02392 123456
French phone number: +332392 123456