Q: Ipad 3 3G problem

My ipad seems to not have the 3G logo displayed next to my service provider and instead, has the circle. I can still surf the net, however the connection is much slower than the usual 3G. I have called my service provider and they resetted my network setting and all, but the problem seem to not go away. I need to know whether my connection or my Ipad is the one facing problems.