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Samsung SCH-U520 is a phone released on December 7, 2006 by the former U.S. wireless operator Alltel Wireless. The phone was the first phone to support Alltel's Axcess Mobile Guide service. The service allows customers to hear voice turn-by-turn navigation, view maps, find locations, plan trips and more.
Usage sensitive three-way call *72 1172 Unconditional forward: All calls *73 1173 Call forward: Cancel *74 1174 Speed calling (8 numbers) *75 1175 Speed calling (30 numbers) *77 1177 Anonymous call rejection activation *78 1178 Do not disturb *79 1179 Do not disturb disable *80 1180 Call blocking disable *81 1181 Priority call disable *82 1182
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.
Another use is to indicate a request for voice conferencing, for example, a user may use a procedure like the following to initiate three-way calling. This is the typical procedure in most North American networks and some office systems: Pick up phone handset (causing the line to be off-hook). Hear a dial tone.
Alltel Family Finder: Similar to Verizon Wireless's "Family Locator" service, Alltel offered a service dubbed Alltel Family Finder where users on family plans could download software to their children's phones and use GPS technology to acquire real-time location information either directly on their phone or on the computer.
AST SpaceMobile made history in April 2023 by completing the first two-way phone call via space on an unmodified cell phone. This milestone was achieved using its low Earth orbit satellite, Blue ...
Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply using GNSS .
The Samsung SPH-A640 (also A640) is a tri-mode dual band cellular telephone developed for PCS carriers like Sprint Nextel in the United States and Virgin Mobile in Canada. It was released in mid to late 2006 in most areas in the United States and other countries such as Canada.