My 11 year old dd inherited her sister's old iPhone 5s when she started secondary school in September. She is already campaigning for a new one. She's been moaning it doesn't work properly.
I've had a look at it tonight and she does have a point - it doesn't seem to connect to the wifi very well and she has trouble using various apps.
Dh thinks it would be spoiling her to get her a new phone so soon but he isn't yet aware of the problems she's been having.
What phones do your dc have and how often do you replace/upgrade?
I should also say that I also have a 5s and I'm not sure about my 11 year old having a better phone than me!