A mobile device making a data connection must be configured with an APN to present to the carrier. The carrier will then examine this identifier to determine what type of network connection should be created, for example: which IP addresses should be assigned to the wireless device, which security methods should be used, and how or if, it should be connected to some private customer network.
APN is the name (web address) of an access point for GPRS/EDGE/UMTS data connection. Usually wireless carriers provide the APN to their end users.
A structured APN consists of two parts as shown in the accompanying figure.
Network Identifier: Defines the external network to which the Gateway GPRS Support Node (GGSN) is connected. Optionally, it may also include the service requested by the user. This part of the APN is mandatory
Operator Identifier: Defines the specific operator’s packet domain network in which the GGSN is located. This part of the APN is optional. The MCC is the mobile country code and the MNC is the mobile network code which together uniquely identify a mobile network operator.
Examples of APN are:
three.co.uk (Note: This example APN uses a domain name from the DNS which belongs to the operator)
internet (Note: This APN example does not contain an operator)
NXTGENPHONE (Note: Does not contain an operator, however in practice it is AT&T Mobility‘s LTE APN)
VZWINTERNET (Note: No operator, but the APN name clearly identifies Verizon Wireless)
mobitel (Note: APN name clearly identifies operator Mobitel)
LTE networks use APN-FQDN format, which differs from the 2G/3G format described above as follows. “apn.epc.” is inserted before “mnc<MNC>”, and the “.gprs” at the end becomes “.3gppnetwork.org”
For example: the 2G/3G internet.mnc012.mcc345.gprs becomes internet.apn.epc.mnc012.mcc345.3gppnetwork.org .
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