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However, activating mobile services on AT&T will permanently lock the Apple SIM to AT&T, requiring the purchase of a new Apple SIM in order to use a different carrier. [ 4 ] The Apple SIM is known as a Removable SIM with Remote Provisioning [ 5 ] – it is a special SIM card that may be configured with different operator profiles.
An iPhone 4S activated on a CDMA carrier, however, does have a SIM card slot but does not rely on a SIM card for activation on that CDMA network. A CDMA-activated iPhone 4S usually has a carrier-approved roaming SIM preloaded in its SIM slot at the time of purchase that is used for roaming on certain carrier-approved international GSM networks ...
The alternative to OTA bootstrapping is SIM bootstrapping, where the phone reads the network settings stored on a SIM card. SIM bootstrapping has limitations: settings stored on a SIM card may become stale between the time the SIM is manufactured and the time it is used; also, some phones (and other cellular client equipment) do not use SIM cards.
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.
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.
If you switch from POP3 to IMAP, only new messages will move from the server to your devices. Any emails previously saved on your device by a POP3 client, won't transfer. After migrating your Verizon.net email to AOL Mail, follow the steps below to set up your 3rd party client.
Be aware some sections will link to the client's help page, and they can't answer questions about AOL Mail settings, or your Verizon.net username or password. No matter what application or software you use, the POP sever and port settings will be the same. Just make sure SSL is enabled and you use your full email address, including @verizon.net.
Cricket Wireless noted on its old website that CDMA service would be terminated as early as September 2015. Most devices prior to the merger would not be compatible on the GSM network except the iPhone 4s, iPhone 5, iPhone 5c, and iPhone 5s. Compatible iPhone devices would only require a new SIM card.