I remove the sim card from my phone and pop in to the dongle. If I'm flying from my house, I connect the controller to my home WiFi. If I'm out of the house, I use the WiFi hotspot from my wife's phone to connect to the controller. Both methods...
Sorry, your info is not correct.
You need to have a sim card in the dongle AND internet connection to the RC. The internet for the RC can come via router wifi, mobile/phone hotspot or you can have a second dongle in the RC, with a second sim card.
Yes, some birds are currently very aggressive towards the drones because we are at the middle of the nesting season. Seagulls in particular are a PITA, be careful. :)