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The international mobile subscriber identity (IMSI; / ˈ ɪ m z iː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network.
An iPhone 4S that has been unlocked in this way will reject any non-international SIM cards (AT&T Mobility or T-Mobile USA, for example). The iPhone 5 and later iPhones use nano-SIM in order to save space internally. The iPhone XS and later iPhones added eSIM support in addition to nano-SIM, therefore they support Dual SIM functionality.
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.
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. AT&T [32] and Telus [33] also use an allowlist for VoLTE access, but does not require IMEI registration by customers ...
An eSIM (embedded SIM) is a form of SIM card that is embedded directly into a device as software installed onto a eUICC chip. First released in March 2016, eSIM is a global specification by the GSMA that enables remote SIM provisioning; end-users can change mobile network operators without the need to physically swap a SIM from the device.
Full mobile number portability in Ireland is a very simple and rapid process, driven by the customer. The request is made to the new operator, then automatically confirmed by SMS or a voice call using a code. It normally completes within a few minutes. Many operators can process requests automatically online through their websites.
T-Mobile is trading at ~9.3 times Nispel’s above consensus fiscal 2026 adjusted EBITDA estimates and ~15.1 times his fiscal 2026 price to free cash flow ratio, which compares to T-Mobile’s 3 ...
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.