Yes, during the sign up process you will be able to choose your number. We offer all 650 UK landline dial codes.
If during the sign up process you can't find a number you like, please email our support team (support@onsim.uk) with the area code you are looking for and we can see if there are any other number options we can provide for you in that range.
If you already have a number, you can also choose to port that over to us and can choose this as an option during the sign up and order process.
To sign up and order your SIM please visit here - Sign up
If you have any questions during the sign up process please do not hesitate to contact our support team by calling 03338804008 or emailing support@onsim.uk.