o2 is sometimes spelt as 02. This is PAYG (pay as you go) prepaid sim card is Preloaded with £15 credit. You can exchange £15 credit for 15gb data. It works on any unlocked 2g, 3g and 4g mobile phone in the UK and abroad (with roaming). O2 has cheap European roaming offers for travel.
You need a cutter to cut this SIM card as it comes with triple hybrid/multi adaptor (standard, micro & nano). It, therefore, will fit all types of a dongle and mobile phones like old Nokia 3310 or new Android phones and in popular Samsung models such as s4, s5, s6, s7, s8, j5, a3 and a5. It also works on Apple iPad and iPhone 5, 5c, 5s, se, 6, 6s, 7, 7 plus, 8 and iPhone x. And on other makes like Motorola Moto g5