I want to send my son my spare Samsung as his phone has broken. I've deleted all apps I used and all my texts and regular emails, but cannot see how to delete all photos in gallery( there are hundreds!!) without going through each one individually. I've already backed them up to the Cloud. Also cannot delete Gmail.
I know you have done it but did you know you can also do a factory reset on your phone which basically wipes everything off the phone and does a reinstall of the Android software and all the apps.
I suggest your son does a factory reset so he can set it up the way he wants it.