2G or 3G data API

I'm trying to find out if it is possible to write an app to send data to a phone number using 2G or 3G Network? If so, what are the APIs that are available开发者_如何学运维? Is there one for this purpose in J2ME. Thanks.

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You could possibly use push registry technology.

http://developers.sun.com/mobility/midp/articles/pushreg/