<P> A SIM lock , simlock , network lock , carrier lock or ( master ) subsidy lock is a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and / or networks . This is in contrast to a phone ( retrospectively called SIM - free or unlocked ) that does not impose any SIM restrictions . </P>
<P> A SIM lock , simlock , network lock , carrier lock or ( master ) subsidy lock is a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and / or networks . This is in contrast to a phone ( retrospectively called SIM - free or unlocked ) that does not impose any SIM restrictions . </P>
what is locking a number on a cell phone
what is locking a number on a cell phone
a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and / or networks
a technical restriction built into GSM and CDMA mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and / or networks