Check for WiFi connectivity, and if it isn't, reboot or reset the router. Make use of your mobile internet and make sure you don't run out of data on either device. Also, check the airplane mode and carrier signal. I would also recommend that you restart your phone. It can aid in the jumpstarting of projects and the reallocation of mobile resources. Running apps and their performance can be harmed by having too many programs open in the background. Check to see if Telegram is currently connected or operational.