3G modem

I need co connect 3G modem using USB host shield.
Is it possible to send data using 3G? We have only 2kb of RAM, and 1kb is used for other data.

Is it possible to send data using 3G?

If you write the driver correctly, yes, it is.

We have only 2kb of RAM, and 1kb is used for other data.

So, you still have 1kb. What is the other 1kb being used for? Perhaps some of that could be moved to Flash space.