If you get a New O2 Pay As You Go Sim Card then you can keep your Number. However you will have to transfer your Contacts if they are stored on the Sim Card your looking to swap.
Keep using the old Sim Card till it loses service. Then insert the New Sim Card and keep rebooting the Phone till it shows service on the new Sim Card.
@amam Hi, also, if it's the SIM size type you are wondering about, the new SIM will be Standard size with cut out for Micro and Nano, so will fit any phone.
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