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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM locking curbs this by prohibiting change of network (using a new SIM). In some countries, SIM locking is very common if subsidized phones are sold with prepaid contracts. It is important to note, however, that the technology associated with the phone must be compatible with the technology being used by the network carrier.

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

4. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, prepay, or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed or consumed.

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

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

   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.

6. Prepayment for service - Wikipedia

   en.wikipedia.org/wiki/Prepayment_for_service

   Recent statistics (OECD Communications Outlook 2005) indicate that 40% of the total mobile phone market in the OECD region consists of prepaid accounts. This service was invented by Portuguese provider TMN, while researching for a means to increase penetration of mobile technology by allowing anyone to buy a fully working (usually requiring a quick and simple activation process) mobile phone ...

7. U Mobile - Wikipedia

   en.wikipedia.org/wiki/U_Mobile

   U Prepaid are alike to U Postpaid, since both of them are 5G plans. U Prepaid has three plans: Prepaid U25, Prepaid U35 and Prepaid U40. All three U Prepaid plans come with unlimited data and calls, with FUP. U25 has a FUP of 30 GB, while U35 and U40 have a FUP of 100 GB, data usage after FUP limits will be reduced to 512 kbps.