It is possible that the phone has hung up because there are errors in the software. So to reset remove the battery and the memory card from the phone. Using your PC , scan the memory card for any corrupt files or media files with virus- it is possible when they are downloaded from unsafe sites. If so remove or format the card. Copy only valid files to the card and do a scan before it is replaced. Now replace the card and battery and switch on the phone. If the phone hangs up or is slow when it is switched ON , then it is confirmed that the software has errors and will need a reinstallation.
Seeking help from the authorized service /support centre is most ideal. Take estimate and decide.
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