Things have changed I think. People communicate by text more than picking up a phone. It is ok actually as you can read it when you want - not like the phone which you have to pick up really or people think you rude! Text etiquette is very strange - easy to misinterpret meaning sometimes. People also have mob phones on constantly so don't find a text an intrusion. In my school it is used a lot to and from everyone. Sometimes one teacher texts me quite late so it works both ways. Give it a go! Might be helpful.