Can I use my iphone 4s in A different country?

I'm traveling to london this summer and i'm from america so i was wondering if i get signal over there and how can i use my phone without getting charged? I have spirnt btw. Also do they have Wi-Fi in london? Sorry i dunno cuz i never been. And someone told me they have different sockets but i find that pretty hard to believe.

Yes you can! And they do have different sockets!

Yep I'm in the uk and I could use it in France:-)

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