The main communications operator, Verizon，AT&T，T-Mobile，Sprint
Active phone numbers proportion statistics:
CDMA system:
Sprint: 22%
Verizon: 23%
GMS system:
T-Mobile: 21%
AT&T: 24%
Other local operators and virtual operators: 5%
Annotate:
Code Division Multiple Access(CDMA) cdma technology principle is based on spread spectrum technology, data transmission needs high-speed pseudo-random code modulation. This data transfer method, the record is easier to collect.
Global System for Mobile Communication(GSM) gms most used for mobile phone communication, communication data transmission interference, change the target location, active phone number record slower.
Active phone number data ratio, only the number of records in the database center ratio. Has nothing to do with the communication operator user base. With the data center database sniffing technology constantly updated and improved, different communication operators will use less and less communication differences.