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This is the very common problem of sprint 7700 dual sim phone.Sprint 7700 dual sim maximum set has keypad problem.Some phone is auto work # key,Some phone is auto Work 1 key and some phone is other auto work other key.
How to do this work : If your phone has this problem if your phone keypad auto work then first open keypad sticker and clean full keypad.If problem still then,See your phone's problem If you see keypad auto work then apply 1st solution that mines remove red mark capacitor and see result.If your phone's problem still then apply 2nd solution just rehot possessor ic very carefully or re-ball ic