Lets talk about a funny chat trick.When we are chatting with someone then sometimes one thing knock our mind that they chatting with me with their computer or mobile.
Here is the solution of the problem.
While chatting, check whether first letter of sentence is capital or not?
If it's capital, so he is chatting from mobile, whereas small letter mean doing it from computer.
In mostly cases it is true, as mostly mobile's text first letter is capital
by default.
It wouldn't be 100% true always, because your friend can also be smart like you & some mobile's
text first letter doesn't be capital by default.