The Original O2 Classic Pay As You Go SIM Card – Standard Micro Nano – 321
£1.35
O2 SIMCARD(3in1 SIM gives Nano/Micro/Standard size all in one sim. 3 in 1 SIM gives the option for Micro, Nano or Standard Sim size. THE POPULAR O2 CLASSIC TARIFF. (Note: O2 are turning off 3G in 2026 check your area for 3G signal). ).
