I've had this problem as well. I have TalkLock installed, so when I unlock the phone from TalkLock and try to pull up the keypad, I get the weird symbols. My issue was when I was calling an automated system and had to punch in some numbers (usually in the morning I call an automated parking system, so I am punching in my spot number). What I did was actually call the number manually (I don't get the weird symbols this way), and then TalkLock would activate. But when I deactivated it, this time the weird symbols did not show up, so I could punch in my spot number. Very strange.
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