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You will not loose the signal on the sim card as u cant do a sim swap on a pay and go number with a pay monthly sim. You need to fill in the below form or ring CS that will do it for you.Once that is done they will then transfer the number u want to keep from pay and go to contract, on the new sim. just make sure u back up anything u may have saved on the pay and go sim or it will be lost.Hope this helps
It's 24h for it to go trough usually, so keep an eye on the signal bar,and 350 is the limit like bandofbrothers>
Do u have auto top up setup? if u do u need to cancel it. also any boltons like friends and family will be lost, only international favourites stays on, all the other ones have to be set up again.
Track usage, upgrade and get support with the My O2 appDownload My O2