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A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.
USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check balance" application hides the details of the USSD protocol from the user. On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance.
Things to know when you change your AOL account to the free AOL plan: If you cancel your billing and change to the free AOL plan in the middle of your billing cycle, you'll continue to have access to the service until the end of your current billing cycle. If you have any active premium subscriptions, those will continue to be billed separately.
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However AT&T allowed iPhone owners who had satisfied contract requirements to unlock their iPhone. [214] Instructions to unlock the device are available from Apple, [215] but it is ultimately at the sole discretion of the carrier to authorize unlocking the device. [216] This allows the use of a carrier-sourced iPhone on other networks.
Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.