Hello All, I have a strange issue with SIM's from a particular operator;
all other SIM's I have used work fine in the GSM Shield, all sketches work fine, everything is in order until I use one particular Operators SIM's,
the SIM is roaming, I can see it connects to the correct network, I can hear paging and I can even hear inbound ringing but I do not get the same output in the "receive call" sketch, I do not get the waiting notification or the incoming number, the call does not hang as it should according to the sketch.
If I run an AT commands sketch I can see the incoming call ringing as its notified in the serial monitor
I know this is not an issue with the shield or sketch so I would like to know if anyone has any idea about SIM's in the shield
NB if the SIM is placed in an iPhone it works as it should so it must be how the SIM interfaces with the shield...
any help would be greatly appreciated
Dan