mobile query

[inquisition]

I have a cheapo Sainsbury's T-Mobile PAYG mobile made by Samsung, its about 6 months old and has no designation nunmber/letters. Its black with screen above key board, no camera or other fancy accessories.
I cant find my instruction book a nd have somehow turned my riner off. on screen at top left an ico of a pair of headphones appeared yesterday and I cant get rid of it or restore setting. Anybody out there who could help please

[Rollo]

Is it one of these?

http://www.t-mobile.co.uk/shop/pay-as-you-go/d eals/

[inquisition]

Hi Rollo,
Its the Samsung E1120 Pay as you go,