What sims can be used on a Japanese locked iPhone 4S?

I bought a second-hand iPhone 4S which is currently locked to a Japanese sim network but I live in the UK. Can any micro sim work and is there any way to unlock my phone if needed?

As of now only a SIM from that carrier would work in it. As far as getting it unlocked there should be services that do so available in the UK.

If you can unlock the phone, you can use any SIM card with it. Check online for factory unlocking iPhone 4S. If you want to unlock the Japanese iPhone 4S, mail me for references.

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