Of course, many times we have to be careful when letting someone do our smartphone, or when to someone handover it. Because a smartphone is a personal thing. There can be a lot of personal things in it. If it gets into the hands of someone else, it could be a disaster.
And I think your new phone can bring you a lot of fun.
Hopefully I cleared everything out properly and there aren't any people out there that will work diligently on trying to recover anything off it. If I kept the old phone I would just leave it in the desk drawer and not use it. Hopefully someone else can get some use out of it now.
The new phone has been very entertaining so far. I like it a lot.