Safety measures for repairing or dumping old phone


In the zone
I have a 4 year old Lenovo K5 Note. Its battery was to be replaced. Recently, the phone did not charge at all. A local service center person said that there is problem in phone's board & it is difficult to get a replacement. I had already backed up important files from the phone but haven't deleted them from phone, my mail accounts also there in the phone. I have number password lock enabled. I am yet to contact the official service center. Is there any chance for the servicemen or anyone who get my phone (if I sell it to waste collectors) access my phone's contents?
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