crwdns2934241:0crwdne2934241:0 Stephen Adams

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Many phone sim card holders have a switch to detect the card.

The switch s normally closed, it opens when the card is inserted.

The CD signal is on the far right  hand side of the holder.

If you cannot get inside the holder, cut this pin from the pcb and it  will assume the card is already in it permanently.

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open