Well, just for the record if the OP is still after a mobile, or anyone for that matter who wants just a cheap basic one, Carrefour are doing the Sveon SMB102 for €12.99
I've still got a while on my contract for my UK Smartphone, but had to have a Spanish number. So bought a SIM and I also bought the above 'phone from the Torrevieja Hypermarket. It comes with a charger, is Unblocked and is even Dual Sim and apparently can connect to the Internet. Also, takes a memory card.
It's just like going back 15 years or so:-)