Best solution for 5S iOS 7.1.1 (EE UK)

I have iPhone 5S, updated to iOS 7.1.1

The phone is locked to EE/T-Mobile/Orange UK.



I want to use it in Pakistan with Ufone simcard.

What is the best solution?



R-SIM Mini 2

R-SIM Air 2

R-Sim 9 GOLD ?



Please help, thanks.

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