This thread is a bit old now, but if you have landed here looking for recommendations, we've recently updated our guides to the best dumb phone for kids and best phones for kids featuring phones tried and tested by Mumsnet parents.
We hope you find this useful.
MNHQ 
--
Eldest DD is only 10 and isn’t asking for a phone yet but I know the time will soon come. I really want to get it right so she’s not a social outcast but also I don’t want her addicted to her smartphone. This is my plan…
When she’s 11 and in last year of primary school get her a basic phone so she can call and text message us and her friends but she can’t download apps or search on the internet and see dodgy things. She can (and already does) have access to a family iPad that she can use in family areas at home, not her bedroom, where we can keep an eye on what she’s looking at. This is unrestricted at the moment and hasn’t been a problem, as she gets older we might need to restrict it a bit.
As parents of teenagers tell me, am I totally naive? Is this going to work? Tell it to me straight and please pass on any tips on how you manage your teenagers and their phones.