14GB £10 offer

[GregF]

Hi,

I use pay as you go (standard) and got a new sim for the £10 offer unlimited texts and calls (14GB) as big bundle. If I move to the big bundle:

1) can I come off it any time (and get back to my old pay as you go)?

2) do I need to change my current sim for the new received sim or can I do it directly from my current sim? If so, how do I go about it (I don’t want to change number and would prefer to keep my current sim).

thank you. Greg

[Enlli]

If you move on to Big Bundle you can't move back to the old style PAYG 

[pgn]

If you are fine with what @Enlli writes above, if you want to use the new SIM, you'll need to swap service and move your number to it, if you want to keep your current number @GregF - Guide: Sim Swap: a mini guide 2017 update has the background, and your MyO2 contains the means to do it reasonably painlessly: 

You will need to have both SIMs with you when you do this. Good luck, @GregF.