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Cancel your previous service
If there is time remaining on your contract, you may have charges to pay. Even if you are out of contract you still need to tell your previous network provider you want to leave to avoid double payments.
The easiest way to do this is by auto switching, where you request a ‘port authorisation code’ (PAC) or ‘service termination code’ (STAC) code. Get a PAC code if you want to keep your existing number, or a STAC code if you want a new number. As well as being quick, the benefit of auto switching is that you avoid double billing.
Get a PAC or STAC code by calling your previous network operator, or texting 'PAC' to 65075 or 'STAC' to 75075. You should get a text within a minute containing the code and detailing any early termination charges.