BT Cellnet - Philips C12 (my Dad's old phone - don't think I ever used it)
T-Mobile - Nokia 8310 bought through mobilerepublic. Very nice simple phone, apart from occasionally crashing and loosing an incoming SMS. Gave away as gift.
Orange - SE T610 bought from Carphone Warehouse. Okay phone, very slow to use. Kept as spare.
Orange - Nokia 2650 bought with enormously discounted tarif from onestopphoneshop. Basic phone, but very useful flashing lights for missed calls. Poor earphone quality (distorts). Lent to my brother (permanently, it seems!)
Orange - SE K750i, upgrade through Orange retentions. Very good phone, once software updates fixed the crashes. Stolen from my flat.
Orange - SE K750i, refurbished, bought from Orange to replace stolen one. Sent back immediately due to dodgy thumbstick.
Orange - SK K750i, refurbished, to replace one with dodgy thumbstick. Fault causes constant crashes. Didn't get around to sending it back before the 90 day warranty ran out. Going to sell for spare parts on eBay.
Orange - Nokia 2652, bought on PAYG from P4U to stand in for faulty K750i. Identical to 2650, same problem with distortion.
Orange - Nokia 3220, bought on eBay to solve all my phone problems. Cost £12.. love it!