on 13-11-2018 18:24
If you get the classic 321 PAYG SIM you can top up whenever you need to.
All calls, texts and data will come from your credit.
OnePlus 6 (O2 & Sfr), Z3 Tablet (Three UK), iPhone7 (EE)
on 14-11-2018 08:05
on 14-11-2018 08:26
The only thing to remember is that you do need to top up at least once every 999 days and make a call or send a text every 180 otherwise o2 will think the sim is inactive and will close it.
Whcih is very inexpensive way of keeping your sim active @Kazzy803
Welcome to the forum by the way