How Android phones set up the internet via APN

Today a friend asked me about the Android network settings, the feeling is still very interesting, special share the following:

He was in Hong Kong bought a LGP500 mobile phone, System is the Android system, but can not go online after the internet, so searched the internet a lot of information, but the settings are always saved unsuccessful.

His settings are as follows: (because the number is moved, it is set according to the parameters of the move)

settings that cannot be savedFirst access point: Mobile WAP Internet access point settings
Name: Cmwap
Apn:cmwap
Agent: 10.0.0.172
PORT: 80
mcc:460
mnc:00
APN Type: WAP

Second access point: mobile net Internet access point settings
Name: cmnet
Apn:cmnet
mcc:460
mnc:00
APN Type: Default

Third access point: Mobile MMS access Point settings
Name: Cmwap MMS
Apn:cmwap
Agent: 10.0.0.172
PORT: 80
Mmsc:http://mmsc.monternet.com
MMS Agent: 10.0.0.172
MMS Port: 80
mcc:460
mnc:00
APN Type: MMS

Then I saw the colleague in the domestic buy Android phone, also like this set, feel very strange, in the end is where the problem.

Found on the Internet, there is such a text in particular caused my attention:

When setting up the APN, the MCC and MNC are required, and the 2 items will not be saved if the APN settings are not filled!

So with this conjecture, the phone rom different, MNC item 00 is considered as a null character processing? And then cause the save to be unsuccessful?

If so, how should the problem be solved?

Think about the move should also think of such a problem, then whether there will be another number to replace 00 for the MNC number?

Another look at China Mobile's MNC number, and sure enough there is another number exists, that is 02.

So let friends to the MNC number from 00 to 02 and try again, the result is successful, but also normal internet.

finally save the successful settingsFirst access point: Mobile WAP Internet access point settings
Name: Cmwap
Apn:cmwap
Agent: 10.0.0.172
PORT: 80
mcc:460
Mnc:02
APN Type: WAP

Second access point: mobile net Internet access point settings
Name: cmnet
Apn:cmnet
mcc:460
Mnc:02
APN Type: Default

Third access point: Mobile MMS access Point settings
Name: Cmwap MMS
Apn:cmwap
Agent: 10.0.0.172
PORT: 80
Mmsc:http://mmsc.monternet.com
MMS Agent: 10.0.0.172
MMS Port: 80
mcc:460
Mnc:02
APN Type: MMS

Finally, add a little explanation about MMC and MNC:

MCC+MNCmcc= Mobile Country number, consisting of 3 digits, uniquely identifies the country to which the mobile user belongs, and our country is 460.
mnc= mobile network number, generally composed of 2 digits, China Mobile is 00 or 02, China Unicom is 01.
The carrier number is MCC+MNC.
46000, "China Mobile", "CN" mobile
46001, "chn-cugsm", "CN" China Unicom
46002, "China Mobile", "CN" mobile

How Android phones set up the internet via APN