Unclear sounds and disturbing calls – MobileVOIP international calls Review

I have been using the app for about two years. It seems convenient, however when your balance get low the quality of calls decreases as well. Sometimes it suddenly cuts off. More annoyingly I have been recently informed by friends abroad that they receive calls from me and I have no ideas about it. This is seriously annoying, SOLVE it PLZ.
Review by Khawlani on MobileVOIP international calls.