I am interested to buy Samsung s10 (without tariff) and I am already an o2 customer.
My question is can I also use any other connection in the phone? If I am travelling to some other country in Asia where o2 is not available so I need to use the sim form that country?
Second question, I also have a T-mobile network (Given by my company) can I also use that in my o2 samsung s10 (dual sim)