open phone

So what’s the advantage of an open or unlocked phone?

A main advantage to having an open phone (or unlocked phone) is that it works with any operator's SIM cards. An unlocked phone gives you more flexibility as to where you can buy your cell phone service. You also have a greater choice of phones since the unlocked ones are not sold by your service provider. You have to pay the full price for that phone, but you do not have to enter into a new contract with your service provider like you do when you get a "subsidized" (i.e. financed by the operator) phone deal at the operator's own store.
International

Do all operators offer open phones?

Many GSM phone service operators already allow any mobile phone to be used on their networks with a valid SIM and service agreement.  Some even sell SIM cards separately and directly to consumers for their use in any phone.  However, there are many levels of openness and each operator has its own policy.  Ask the operators for SIM-only packages if you want a cell phone and you do not have service with a SIM yet.
International

So what’s the advantage of an open or unlocked phone?

A main advantage to having an open phone (or unlocked phone) is that it works with any operator's SIM cards. An unlocked phone gives you more flexibility as to where you can buy your cell phone service. You also have a greater choice of phones since the unlocked ones are not sold by your service provider. You have to pay the full price for that phone, but you do not have to enter into a new contract with your service provider like you do when you get a "subsidized" (i.e. financed by the operator) phone deal at the operator's own store.
U.S.

Do all operators offer open phones?

Many GSM phone service operators already allow any mobile phone to be used on their networks with a valid SIM and service agreement.  Some even sell SIM cards separately and directly to consumers for their use in any phone.  However, there are many levels of openness and each operator has its own policy.  Ask the operators for SIM-only packages if you want a cell phone and you do not have service with a SIM yet.
U.S.
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