CaesarSrilanka:
Hi,LED is blinking very fast due to the unavailability of network / signal. Check the following.
- does your sim working when inserted to a mobile phone.
Yes, SIM is working when is inserted to mobile phone.
[/quote]2. are you inserting the sim correctly to the sim tray of the module.[/quote]
Yes
[/quote]3. also did you connect the antenna provided with the module (short antenna)[/quote]
yes
I am giving power supply of 5v 2A using adapter to SIM900A still led is blinking fast.
I ordered this module from this site https://www.ebay.com/itm/SIM900A-V4-1-Modul-GPRS-GSM-900-1800-MHz-Dual-Band-Shield-Arduino-Raspberry-Pi/253912590677?hash=item3b1e5ea955:g:520AAOSwRytb3KXH:rk:17:pf:0