The German telecom corporation Deutsche Telekom AG’s mobile communications subsidiaries in the Czech Republic (T-Mobile Czech Republic), Poland (T-Mobile Polska), the United States (T-Mobile US), and the previous subsidiary in the Netherlands all operate under the name T-Mobile (T-Mobile Netherlands).
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Deutsche Telekom established T-Mobile International AG in 1999 as the holding company for its mobile communications companies. T-Mobile International, together with “Broadband/Fixnet,” “Business Clients,” and “Group Headquarters and Shared Services,” was one of Deutsche Telekom’s services from 2003 until 2007. Deutsche Telekom changed its organizational design to a regional one in 2009. (Germany, Europe, US). T-Mobile International itself was incorporated into Deutsche Telekom AG by integrating its previously divided fixed and mobile operations to create integrated local businesses.
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What SIM cards are compatible with T-Mobile? Can I put my tmobile sim card in any iPhone?
The Global System for Mobile Communications, or GSM, network is used by T-Mobile. A Subscriber Identity Module, or SIM, card is used by this kind of network to program devices. Users can easily move between devices thanks to this card’s ability to be transferred from phone to phone. Phones cannot use the T-Mobile network without this card.
To prevent their phones from being used on the networks of other carriers, the majority of major cellphone providers install a specific lock on them. Only SIM cards issued by that carrier are compatible with its phones thanks to this lock. Only T-mobile-provided phones are out of the box compatible with its network due to this lock.


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