Goal: Receive voice calls on GPRS shield.
GPRS Shield V1.4 with SIM900 - Reference: http://www.seeedstudio.com/wiki/GPRS_Shield_V1.0
SIM Card: AT&T USA -provisioned for voice only service, confirmed as active on mobile handset. AT&T customer care claims that the SIM is unlocked (not confident about this statement).
Propery configured Audrino UNO and GPRS Shield with separate power supplies.
Loaded example code from Arduino libary: GMS Receive Voice Call
Manually powered on GPRS Shield, confirmed red power LED and three second flashing "Net Light"
Issue: Every time I run the Serial monitor I only get the response "Receive Voice Call" however no other response is ever received. When calling the shield no answer is achieved.
Confirmed a working baud rate as when changed you can't read "Received Voice Call". Tried all the new line / carriage return options in the monitor.
I called AT&T tech support and they confirmed that they see the IMEI of my SIM900 on their network.
I tried loading and running the "Make a voice call" but never get the oppertunity to type a phone number into serial monitor.
Any thought or experience would be greatly appreciated!!
Is there any issues trying to get voice calls to pass throu the shield when text and data have been blocked on the SIM account? This same SIM card places and receives voice calls just fine in a mobile phone so I think it's provisioned properly for voice only calls.
I also noticed after loading a program as described above to the UNO and fire up the serial monitor that when I type "AT" I get no response in the monitor.
Another possible reason for my issue: I'm using the The GSM library "GSM.h" included with Arduino IDE 1.0.5. All accounts show that this library file supports the Arduino GSM Shield manufactured in corporation with telefonica digital and appears to have a Quectel GSM chipset.
1. Can someone confirm if the "GSM.h" library file will support the GPRS Shield V1.4 with the SIM900 chipset?!
2. If there is a deferent required library file for the GPRS SIM900 chipset please advise where to obtain this file! jmorgan007@iCloud.com