Apple iphone 4 16 gb please read carefully *

Apple iphone 4s 16 gb on tmobile it is not letting me ring out its showing me the carrier and a signal but not letting me ring out i have had it checked by checkmend to see if its lost or stolen or blocked and the report has come back clear and report can be shown aswell which proves everything including the model of phone gb size and the report what they check i am open to the best offer around £200+ ring or text me your best offer if i dont get a decent offer on here i will put on ebay which i know i can make more