Default Thl w200 Chinese smartphone uk users question?

i want to get the thl w200 which supports 2 sims but found that the uk networks do support 1 of 2 the frequency i meen o2 network only supports 900 & 1800 frequency

And i think that's just for calls (i think but could be wrong)

And to use 3g internet i need a network that supports 2100 frequency which o2 dose not but believe three network dose use it so i was thinking if i use 2 Sims o2 for calls and three network for internet.

Am iwrite in what i am saying or could what i saying work? I just don't want to buy this phone and find i have slow internet or bad call quality

I need to find someone that uses this phone in uk to see how it preforms


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