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.
Read moreWhat is the best SIM card to use in the UK?
If you want to buy the best SIM card in the United Kingdom, I recommend going with EE, Vodafone, or Three . EE is the best overall without free EU roaming anymore. Vodafone is great overall (fast, great coverage & EU roaming). Three has the fastest 5G NR speeds but is the worst in all other aspects.
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