It is possible that the phone keypad is faulty and that the digit 7 has failed on the board or contact. So remove the main panel and clean the pads, sometimes dirt accumulation can cuase this inaction. Use some methyl spirit to clean the pads and the board before setting it back. If the phone does not respond , then it is confirmed that the panel has a fault, take consensus.
Seeking help from the authorized service /support centre is most ideal. Take estimate and decide.
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Hi, I think it may Helpful to you
Try to format the phone memory, but this will erase all your data, so, first save the info you need- contacts, photo, etc.
1) Factory defaults-
Type *#7780# on your standby screen.
This will reset all your setting to default factory settings. User data wont be affected. (Default Lock code is 12345)
2) Soft reset-
Type *#7370#
This will reset the phone as well delete user data. Use when want to format the phone.
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