Does prepaid SIM work in UK?

No, as previously stated, a pre-paid is unlikely to have roaming activated for outside your own country . There a few other things you need to bear in mind too: -Your phone itself might work, but would have to be compatible with the cell(mobile) frequencies used in the UK.

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What are the 3 types of SIM cards?

There are three basic sizes of SIM card: the standard, the micro, and the nano . Of the three, the Standard is the original SIM and the largest. Today, these are mainly used on older phones. The Micro SIM card is essentially a standard SIM card with the extra plastic around the circuit board trimmed off.

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