Maybe installing whatsapp on a new phone and connecting it to your old phone number should work. If a backup is present on SDCARD/Whatsapp/databases, then you should be asked in the last step of the install procedure if you want to restore the old messages in the backup.i have my old whatsapp msgstore.db.crypt files.
how can i retrieve the message from the file?
Also if there is no software for it then buying new phone and installing the
whatsapp will retrieve chat?