International SIM card for iPhone 5?

I know my network would still work when I'm out of the country, but because I'm traveling to London next month, would I purchase an international sim over there to avoid extra charges? If so where would I purchase one and do they install it into my iPhone 5? I have tmobile by the way.

You can open your international sim lock you can solve it very easy for detail please visit: www.mega-mobiles.de

Best places in the UK for SIM cards with low charges are;-
ASDA, or TESCO, both supermarkets, or Talkmobile via Carphone Warehouse.
Check them out online.

Actually it likely would not work. You assume it would because of the fact there's a T-Mobile there & in the US. You would be roaming which brings heavy charges.
Also, it would only work if your phone is unlocked in order to accept other carrier SIMs (yes again despite the same name both T-Mobiles are different carriers)

I hope that you are going to have a great trip to UK, London. As a frequent traveller I always had problem with roaming sim cards, the best solution that I found is to combine a VOIP application (like skype or Rebtel) when Wi-Fi is available (but be careful VOIP calling quality is sometimes very low) with an international sim card. The one that I use (it has the cheapest rates that I found) is MySims2Go, and is a UK based company so it has really low roaming costs from UK.

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