Iphone and vehicle gps tracker

  wobbler 20:27 09 Apr 10

Firstly hope thisis the correct forum for this topic. I have an iphone 3gs on Orange. I also have a GPS tracker with an orange sim card in it. This device works by texting it with a command and it replies with its location. It can also txt a dedicated number with a msg when activated. This drvice works fine on any network with any sim I choose. However with my sim in my phone it only receives alarm txts, it does not respond to txts I send from the iphone. I put my sim in another phone it works Ok, so it looks like it doesnt recognise txts from the iphone. My iphone does send and receive txts to other phones OK. Any ideas?

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