How to assemble an inexpensive GSM SMS gateway?

Question

Arduino

Hello! There is a need to assemble something like a gateway for sending SMS messages from 4-6 sim cards, i.e. all messages that will come to these SIM cards must be recorded or immediately sent to one single number. Those. Is it possible to use "Arduino" + "GSM module type SIM800" x 4 for this or instead of Arduin's Raspberry PI? Is there a simpler and cheaper way?

Answer 1

It's better to use RPi + active USB - hub (so that there are enough ports), stick regular modems there and install asterisk.

Answer 2

do you really want to solve the problem with iron?
As for me, it’s cheaper and easier to solve this problem by simply forwarding calls / sms or whatever you need directly from the operator, and not soaring your head =)