Hello!
I had been looking for a reliable gsm sim900 and found the following:
https://www.aliexpress.com/store/product/GPRS-GSM-Module-EFCom-Pro/414230_689386403.html
http://www.ebay.com/itm/SIM900-Quad-band-GSM-GPRS-5V-Minimum-System-Module-with-Antenna-/121667828810?hash=item1c53f7bc4a:g:Xr8AAOSwNSxVbWyU
http://www.ebay.com/itm/RED-HOT-GSM-GPRS-Shield-Development-Board-SIM900-Quad-Band-Antenna-/261942260449?hash=item3cfcf9b2e1:g:DgAAAOSwBLlVDVBb
Although i'm not sure if the last link is a good one. It just seems sloppy.
THE APPLICATIONS:
- I only need the functionality to send and receive SMS messages.
- prefer it not to be a shield.
THE QUESTION:
Did anyone work with the modules in the links? if yes are they working properly? if not can you recommend any other gsm sim900 that you have worked with?
thanks in advance!