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You will need to ensure your mobile phone is GSM compatible to roam in the UK and you will find using a UK SIM card to be much cheaper.
To use a UK SIM card you will probably need to ‘unlock’ your phone. You can then use a pay-as-you-go system to pay for the calls you make.
When you arrive the International Office will give you a free mobile SIM card which has a small amount of credit so you can phone home.
If you’re not bringing a mobile phone you may find it useful to have a credit card or, if possible, a small amount of loose change, so you can call home when you first arrive.
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Guide for International Students 2012.