O2 Classic Pay As You Go SIM Card 2023 model, you cannot buy these directly from O2 anymore No need to top up monthly credit rolls over month on month (make at least one call in a 6 month period to keep SIM active) Use in any unlocked phone ALL DEVICES - Trackers, Smart Watches, Tracking Device, Phones. Trio-SIM - Micro, Nano or Standard size option Calls = 3p per minute Texts = 2p Data = 1p per MB Top Up £10.00 to activate the SIM