Unlocked mobile (Old St Mellons CF3)

My mobile is broken. If anyone has a mobile they no longer need, I would be very grateful. I only need it to make calls - well more to receive calls really. But a smartphone that I could also download the bus app to would be great. I have a Vodaphone SIM that I'd be putting into the phone so would need to either be Vodaphone or unlocked if possible. I don't drive, so as local as possible would also really help. Thank you for reading.