Will you lose your mobile phone number / how to transfer your mobile number?

Call or text your current provider to request a mobile PAC code.
Text to Switch is simple. All you need to do is text PAC to 65075 and you’ll get your code straight away, you don’t even have to make a phone call.
Contact your new network and give them the PAC code.
Contact your new provider and provide them with your PAC code. When you provide your PAC code to your new provider, the cancellation process will begin automatically with your old provider. Once your new provider has the code, it will get in touch with the provider you're leaving to tell them about the number transfer and will schedule the switch. This will normally be for the next working day
Check the SIM works in your phone and the new number has ported across