Which gsm module is best for Raspberry PI?

Question

mobile connection

Hello. I want to assemble a device for receiving / sending SMS and connecting to the Internet. Ideally, if it also calls, but not necessarily. I am not familiar with Raspberry PI, especially with GSM modules. The question arises which module to choose and what could be the price of such a product with assembly?

Answer 1

Asterisk + ChanDongle (ChanDatacard) + Kannel