(Hi! can I keep my old mobile number on Virgin PAYGO if I get new micro sim on Virgin Paygo? Buying new smart phone (1st ever), but not bought from Virgin.
yes you can
You just need to give the Virgin mobile team a call on 789 from your mobile or 0345 6000 789 from any other phone & request a new SIM of the correct size (or a "multi" SIM).
Alternatively you could trim your present SIM down to size yourself (sounds scary but really easy).
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