unable to connect devices

MyQ garage door opener, honeywell thermostat, brother printer and, Dell laptop not connecting to network. Printer will State connected but does not show on connected list. Door and thermostat cannot find connection and, tmobile network does not even show up as a network on the PC. Seven other devices connected with no problems. Network not hidden. Computer has all current updates. What the hang is going onand what is the solution other than going back to my old provider?