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.
Read moreWhat 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.
Read more