Any old mobile phones

Hi All
I am a childminder in Birmingham. I am trying to collect 165 old mobile phones ( must me less than 10 years old with battery) for Hearts and Minds challenge. They exchange mobile phones for an Ipad2 for chidren on the Autistic spectrum. I have a 10 year old son myself who has Aspergers and amso care for a child with ADHD. They are both being currently taugh at school how to touc type using the ipad so that they can do their Sats using Ipads instead of writing. It sound like a brill system and I am trying to save up for an Ipad for then and so far have saved £200 so am a ong way away from the £400 plus that they are and this is an alternative way that we can look at.
Would appreciate any help

Debbie