Roaming detection from J2ME Midlet

[prsth]

Hello,

We are making an application that is going to be signed with an operator certificate, so we suppose that our midlet will be allowed to send SMS messages without a user confirm. There is no cheating and all of them will be free This is only a guaranteed way to communicate with server-side without the necessity of internet access.

Everything is seems to be alright, but the question with roaming arised. If any user moves to another region or country all outcoming SMS messages will cost him a lot, even if they are pointed for free short numbers.

How can we solve this using J2ME API? I could find any API that will let me to check if the mobile is in roaming.

Thanks for help.

[symbianyucca]

to be fully honest I have not tried this with Java, anyway, in general the Cell ID should contain the country Code & operator code, just as the IMSI does, so you could compare them to see whether you are in your own network. Here's wiki articles to get you started:
http://www.developer.nokia.com/Commu..._ID_in_Java_ME
http://www.developer.nokia.com/Commu...MSI_in_Java_ME

[petrib]

As far as I know, the cell-id is just an abitrary identifier selected by the network operator to identify the basestation (cell). If it encodes country information, it would be up to the operator to do so, if they find some reason to, but then you'd need to know how the operator has done such encoding).

Nokia-specific system properties such as com.nokia.mid.countrycode, com.nokia.mid.networkid, com.nokia.mid.lac, com.nokia.mid.mnc might be more useful:

http://www.developer.nokia.com/Resou...roperties.html

[symbianyucca]

in symbian it at least did come with MCC and MNC , though as said, I never have tried this with java.