Best way to use iPhone in Slovakia, do I use another sim?

I'm travelling to Slovakia in May for 8 days and am looking into how I can use my iPhone for internet without paying a small fortune. I'm currently on O2 and I'm not sure if my phone is locked to O2.

What's the cheapest way of using my iPhone for internet in Slovakia? Should I get a slovakia sim and phone number?

I think you can get a SIM card over there to use, but I'm not sure if your O2 phone is considered to be locked to oversea networks. Why not ask O2?

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