sony ericsson w395 repair?

my litle sister was caught with a needle and my phone earlier tonight. she had removed the little circular cover found on the back of most sony ericsson phones and was poking around with a needle in there. afterwardsi lost recpetion in places i always have full recpetion and havnt managed to get recpetion anywhere else.
are these events are linked and if yes, how do i fix the problem!