gsm shield not working

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hi am new to gsm shield, i bought the arduino uno R3 and placed the shield on 
it and just connected it to the pc nothing more

when i do the testmodem it tells me error, modem isnt answering
and for the baudtest it gives no reading its like the shield isnt really 
connected
some guys says that u need apower supply to your shield to work 

i dont know whats the problem and if its in the power how can i pass it to the 
shield while it is placed on the arduino 

this picture is for my shield  

Original issue reported on code.google.com by ahmadzou...@gmail.com on 11 Oct 2013 at 9:53

Attachments:

• gsm.JPG

[GoogleCodeExporter]

This issue section is not longer supported.
Please check the support page www.gsmlib.org 

Original comment by martines...@gmail.com on 16 Oct 2013 at 2:27