Thanks everyone. I went with Time stamp. Yes, I agree it is odd we can't just do it with our phone without needing an app.
There is one particular set of phone shops that requires the time stamp on the picture in front of the store with one of the companies. They have a lot of Apple and Samsung shops that pay $16. It might be at ATT, TMobile, Best Buy, Verizon and so on.
Is there a limit to how many shops you can do a month or period? I completed six and now can't assign myself any. There are no dates available when I try to take some.
Thanks,
Mary