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The Sanyo PRO-700 is like all Sprint phones and uses the CMDA network so no Sim card is used. You can take the phone to the Sprint store and have the clerk's use the transfer machine and that should delete the duplicate entries.
Hey! I just got the PRO 700. IT DOES NOT USE SIM CARDS! instead like the other sprint phones it uses the ESN/MEID number on the back. Just call sprint and tell them you want to do an ESN SWAP or SWITCH TO A NEW PHONE and they will ask you for the number under the battery. They will also walk you through activating everything including Direct Connect. It is as fast as Nextel traditional Direct Connect but it has a MUCH LARGER COVERAGE AREA FOR VOICE AND DIRECT CONNECT. Soon these phones will take control and the whole IDEN network Nextel uses will be converted to CDMA (sprints High Speed Network).
One thing you could test for is a thermal-fault in the phone's circuitry. To do this, you put your phone in the fridge over-night then, turn it on the next day and try the keypads while it's still cold from the fridge. If that doesn't help and you're brave enough to venture into the inner-workings of your phone to attempt repair/cleaning, you can read my post here- keys won't work on sanyo mm 8300 phone. Hope this helps, TechnoWolfy.