The use of the ESP8266 in the world of IoT

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By dvdood
#82879 I'm very new to esp8266 and in general to microcontrollers. Recently i bought NodeMCU V3 ESP8266.
This is the first video i saw, tried to test it and it worked.
However, it's fine when i connect to URL using same wifi with my phone, but if try using mobile data i cannot connect. I would like to be able to connect while i'm not at home using 4g. (not for led light ofc, but other sensor that i'll add later).