The phone used the battery up pretty quickly but now it will go from 100% to 0% when sending a text, then it will shut off. Will not start up again unless I plug it in to a charger, then will show 75% battery. Yesterday, it decided to have no keyboard, for any application - so I cannot do anything on the smartphone. Also, any application seems to be stuck. Is there any hope for me or do I need to do a factory re-set. Is there any way to have the older OS re-installed on the phone?
Thanks in advance.