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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.
The carrier performs a database lookup using the caller's telephone number to obtain the name information for the caller ID service. If the data is with another carrier, then the terminating carrier must perform a lookup and pay a small dip fee to the carrier hosting the information. [ 4 ]
Free database download Active project Data license Comment Cell Spotting 0.1 million [2] 667 no CC0: Combain Mobile >140 million [3] >240 >1700 >131 billion no yes Supports GSM, CDMA, UMTS, LTE and NR via API. [4] LocationAPI.org 157.89 million [5] 240 1712 25 billion no yes Supports WiFi, GSM, CDMA, UMTS and LTE technologies via its API.
Spy Dialer is a free reverse phone lookup service that accesses public databases of registered phone numbers to help users find information on cell phone and landline numbers and emails.
Calling by using a new personal E.164 number (the ENUM number) to look-up at a database is therefore an indirect calling support service. The ITU ENUM allocates a specific zone, namely "e164.arpa" for use with ENUM E.164 numbers on the IP side of the network.
According to an anonymous source, the database is "the largest database ever assembled in the world," [1] and contains call-detail records (CDRs) for all phone calls, domestic and international. A call-detail record consists of the phone numbers of the callers and recipients along with time, position and duration of the call.
Download time may take 10-15 minutes over dial-up. Call 1-888-265-5555 to order a CD for faster installation.
Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x