I am going to change from Simply Paygo to Classic Paygo, as I don't use my mobile phone a lot. I have ordered the free SIM and will be paying £10 to activate the new service. I have around £4 credit left on my Simply Paygo SIM. What will happen to this?
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To confirm you can keep using your current sim and just change the tarrif.
No need for a new sim.
You can change here under your tariff settings http://www.o2.co.uk/myo2
Track usage, upgrade and get support with the My O2 appDownload My O2