SIM900 GPRS shield not working

[CCONWAY100]

Hi,
I was previously on an existing thread, but asked to move to a new thread. I have been battling with the GPRS shield for 5 days now...

I have the shield plugged into a 5v 2a power supply and have even bought a new one to ensure it is not a power problem. I flicked the swicth to external power.

The antenna is connected properly and I am in a high signal area.

There is no visible surface damage on the board.

i have tried 2 different sims with exactly the same issues. The 2 sims have been tested in a mobile phone and work perfectly.

I have left the jumper switches in the default s/w position.

I have pressed the on button for 2 seconds before the red light comes on. The green light flashes every 800ms, and even if I leave it for over 1 hour, does not connect to a network.

I have run the following AT commands on both sims giving the same value:

AT
OK
AT+IPR=19200
OK
ATD07595xxxxxx; //obviously I put a real number in here in my serial window
NO DIALTONE
AT+COPS=?
+COPS: ,,(0,1,4),(0,2)

OK


I cannot see any other option than this being a faulty shield. Can you please tell me how to get a refund. Thanks,Chris

[techsupport]

hello again：

I feel sorry for you ........
NOW I want to know how you send AT commands?
By Serial Monitor or by MCU?
i think you should send AT commands by Serial Monitor first....
set the jumpers to default,and connect Serial device's RX/TXto GPRS Shield's RX/TX.....
powr it on and wait it stable then you can send AT commands
just have a try.............


regards

[CCONWAY100]

Hi, that's exactly what I did.

Thanks, Chris

[techsupport]

hi
do you have other GPRS shield?
if you have one ,it's very pleasure ,and you can Compare it to the one which you think is faulty..i think it is very interesting to find what is wrong with it ...
if you have none, i think you can surf on the internet to find some info first~~~~~~~~

regards

[CCONWAY100]

No I don't. Just yours.

[CCONWAY100]

Just to be clear, I am not buying another GPRS shield to prove that yours is faulty. I'm assuming that's not what you are actually suggesting!?

Unless you have any further ideas, I suggest we go down the route of a refund.

Thanks,
Chris

[CCONWAY100]

hi - any update?

[Candy]

Dear Chris,
I am sincerely sorry for this inconvenience and I aplogize for taking so long time to solve this problem.
As our worker poor English, they could not understand clearly your mean, and do not know how to explain what you should do accurately. But
please remember that I really want to and willing do my best to help you solve the problems as soon as possible.
Would you pls try to open your GPRS IP?
Thanks for your patience and understanding.
Any question, pls contact with us.
Best regards

[CCONWAY100]

What do you mean open the IP?

There is no problem communicating to the arduino, and the gprs shield dies not have is own IP address?

Sorry guys, you have had long enough, I'm going to raise an amazon case against you.

Tks, Chris

[Candy]

Dear Chris
I am sincerely sorry for this inconvenience, but the most important thing we need to point out all the products are in good condition and have been tested before shipped out. But we are serious seller, we do not avoid any problem from our customers', we will do whatever we can do for our customers.
According to your question, our technical team dedicated to write how to use SIM 900 GPRS shield, pls check the attachment, if there any not clear, would you pls kindly refer to our wiki : http://www.geeetech.com/wiki/index.php/Main_Page
Any other concerns, just feel free to contact us.
Thanks for your patience and understanding.