Is is possible to use the gm862 (http://www.gm862.com/en/products/gsm-gprs.php?p_id=12&p_ac=show&p=4) module with celliax module ?
Yes sure it is possible, and will probably works very well.
You have to figure out a little bit the commands, but they give you good docs, and you'll have to interface it to a soundcard, making your own audiocable
telit module: why not?
Yes sure it is possible, and will probably works very well.
You have to figure out a little bit the commands, but they give you good docs, and you'll have to interface it to a soundcard, making your own audiocable