A SIM only deal is a contract that includes minutes, texts and data for a monthly fee, but don't include a phone. SIM only deals are usually a lot cheaper than a standard mobile phone monthly contract that's bundled with a handset.
How does SIM only work?
It's precisely because SIM only deals don't include a phone that they're usually a lot cheaper than standard mobile phone monthly contracts.
A SIM card itself is a microchip around the size of a postage stamp holding all of a mobile phone's configuration information, for example the mobile phone number and call plan. Without a SIM card, a mobile phone will not work.
Once a SIM card has been activated it is permanently locked to the particular network, though not locked to a particular phone. That means you can easily change mobile phone handsets but keep your phone number, your friends’ phone numbers and any saved messages or photos.
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