This solution may help solved and fix Blackberry 9720 with Insert SIM Card problem, for it shows the connection line paths of Blackberry 9720 sim card circuit.
Blackberry 9720 Sim Connecter Jumper
How To Repair Blackberry 9720 Insert Sim Problem
Blackberry 9720 Insert Sim Track, Ways, Jumper, Path
The solution provides an easy quick view of how the SIM connection circuit being mounted or assembled on Blackberry 9720 board. In this solution you can easily trace teh SIM connector line paths and check the the corresponding components connected to it.
Just see the solution preview below for it shows which track to be check and make jumper.
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