I've got a VM sim only which I've had for 6 months.Currently using it in a mobile wifi device.
If I use it in my phone (currently has O2 sim) how do I keep my O2 number?
You can ring O2 and ask for a PAC code - which you then give to Virgin and then the number will transfer.
Be aware that you will lose your O2 account (I assume you are out of contract)
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