Mobile/wifi network exclamation mark I have a problem that almost always my mobile network is marked with exclamation mark and I can't connect to Edge/3G, sometimes this happening to WiFi. I have a Nexus 5 and Android 5.1.1. I'm also trying to enable/disable airplane mode but it doesn't help.

About WiFi, I reload my WiFi router and after it it works fine. Mobile network - it's happening at two cities and seems for everybody around me everything is fine.
The exclamation mark means you have no data connection. Go to Settings and in category Wireless &amp; networks  enable Mobile Networks. This assumes Airplane mode is off.