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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.
When using a SIM card compliant to the BIP (Bearer Independent protocol [9]) in a BIP-compliant handset, the updates can be delivered very quickly as well (depending upon the network connectivity available to and supported by the handset, i.e. GPRS/3G speed). It might also be possible to change the menu of STK applications based on the Wireless ...
The T-Mobile myTouch 4G is a smartphone designed and manufactured by HTC Corporation for T-Mobile USA's "myTouch" re-branded series of phones. HTC's name for the device during development was "Glacier". This is T-Mobile's second "4G" phone, after the T-Mobile G2, and the third smartphone by T-Mobile that runs Android 2.2 Froyo software. [3]
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If a user changed their device, they had to register their new IMEI and SIM card. This isn't the case with other CDMA carriers like Verizon which only used allowlists for 3G (which was a requirement for CDMA) and T-Mobile does not use an allowlist but instead a blocklist, including for former Sprint customers.
A TikTok showing how to unlock any iPhone went viral in December, racking up almost 9 million views. But it’s all a joke. In the video, a person is shown demonstrating how the “hack” works.
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.
The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.
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