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There are 2 Z5s......Dual Sim & normal one sim.....
STOP!!!! you are going to damage the phone, you could use 2 SIM cards IFF (IFF = if and only if) you have the Xperia Z5 DUAL
Was just away to edit my post to say that, there was someone earlier who put a sim in there memory card slot & it is now rattling around inside their phone......so follow the advice above