Why I am I constantly losing signal?

Well first of all I can hear something rattling around inside the phone, if I have dropped it and dislodged something I don't know. When I try to call out it seems to struggle to do it then just ends call by itself before even ringing. And if I do connect it constantly breaks up. Always getting missed calls pop up too when it's not rang at all

But the most annoying thing is the fact my network data won't come on and when it does it only stays on h. A week ago I could get 4g all the time almost.

My partners signal has been fine so know it's not the network.

Is it possible something could be faulty inside? And can it be fixed??