If you own a Sony Ericsson phone you to get great Sim card tariffs from major UK mobile phone networks. Any GSM capable phone can use a Sony Ericsson Sim card but if you want to be able to use the cards provided by different networks you will need to unlock your phone. You should think about either ordering an unlocked phone of the internet or having it unlocked by an independent service provider. Because you are not paying for the phone itself your rates will usually decline quite a bit.
A SIM card has many functions. It can store information such as contacts and appointments and you can transfer this information from one Sony Ericsson phone to another. This makes it fantastic if you have a certain phone that you like to use for different purposes.
Your phones user manual will tell you whether or not your phone can be used with a SIM card. It will also show you how to insert and remove your SIM card so that it can be switched from phone to phone. It is a good idea to learn how to do this shortly after receiving your handset so that you feel comfortable doing so. Most times the SIM card will fit in the phone in such a way that it is located under the battery.
When shopping for sim only deals you may want to think about the amount of talk time you want as well as the amount of data and number of texts you want to send and receive.