When manufactured, GSM cellphones are unlocked, meaning they can be used with any subscriber identity module (SIM) from any compatible carrier service provider. A cellphone may be electronically ‘locked’ by a service provider, in which case it can only be used with that carrier’s service.
Unlocked Cellphone
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Vangie Beal
Vangie Beal is a freelance business and technology writer covering Internet technologies and online business since the late '90s.
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