When I left my phone on the desk today I had service, the same as the bars shows (~80%). When I got back I had a rejected call in history. Also I tried to make 3 international calls today. All of them where disconnected some 3 or 4 minutes in the call. I do not know if the problem is on my side or theirs, they told me that they have problems sometimes. The phone has resided by the desk all the time, when I called and when I left it there, so I think I would have the same service if my service provider is not experiencing fluctuations in the network coverage.