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2. How to buy an unlocked phone, according to a tech expert - AOL

   www.aol.com/buy-unlocked-phone-according-tech...

   When it’s time to buy a new phone, many people head down to their local Verizon, T-Mobile or AT&T store — or their respective booths at Best Buy — to see what’s on the shelves.

3. Mobile phone feature - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_feature

   The most commonly used data application on mobile phones is SMS text messaging. The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993. The first mobile news service, delivered via SMS, was launched in Finland in 2000.

4. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   Carphone Warehouse, one of the largest UK phone retailers, offers unlocked phones with most PAYG deals. [citation needed] As of January 1, 2014, all phones sold by 3 UK are unlocked. Phones bought before this date will be unlocked for free. [71] On 17 December 2019, Ofcom announced that it would explore a mandate banning SIM locking. [72]

5. List of open-source mobile phones - Wikipedia

   en.wikipedia.org/wiki/List_of_open-source_mobile...

   For many components, only proprietary drivers are available [1] (open source phones usually seek components with open drivers. [citation needed]) If firmware is not updatable and does not have control over any other part of the phone, it might be considered equivalent to part of the hardware. However, these conditions do not hold for cellular ...

6. Rooting (Android) - Wikipedia

   en.wikipedia.org/wiki/Rooting_(Android)

   However, the support may be limited only to certain phones – for example, LG released its bootloader unlock tool only for certain models of its phones. [47] Also, a manufacturer could discontinue bootloader unlocking support, as was the case with LG [ 48 ] and Huawei .

7. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   In general, the types of phones and other devices supported by the MVNOs are in line with the technologies used by the Mobile Network Operator (MNO), the underlying cellular network provider. All major and regional MNOs use 4G LTE / LTE Advanced and 5G NR protocols (2G and 3G having been deprecated and shut down), with GSM technologies.