hi, i just bought an iphone 6 Plus 64G i just started using it today and i was quite confused why when i make a phone calls, there's no notification sound for BBM, Whatssapp, line,etc on the phone. so out of curiousity i made a phone call using speaker phone and try to open a page from safari browser, the iphone says no internet connection. and there;s no indicator beside the signal bar, normally there's indicator "E" / "3G" / "4G" that's weird. as soon as i ended the call, the 3G indicator is back on. i never experienced this in my iphone 4,4s,5,5s before. so is this a faulty iphone ? or is there any setting i should set ?