I have a UMDIGI phone
I have a UMDIGI phone, and I suppose you get exactly what you pay for and this was cheap phone and it has numerous problems. The phone rings all the time but 9 times out of 10 when trying to answer a call by Sliding Up the phone wont answer. With WhatsApp often the phone does not ring. I am not deaf and often have the phone on the desk in front of me and it does not ring. The ringer is not turned off when this happens. WhatsApp can always be answered when it rings unlike phone calls. The battery capacity is not adequate to get through 12 hours standby.