I got a 21 ultra. I had 4 samsung phones in the past but I'll never have one again. The 21 is just a piece of s... It looses network connecrivity every 30 seconds, sometimes every 10 seconds. All the solutions suggested in the forum just work for 10 seconds. Should i swich off the phone or the airplane mode on and off every 10 seconds? It is incredible that there are forums about this issue almost 1 year old and samsung has done nothing about it.