Yes. But it has become so common a shortening that it is considered a formal word, synonymous with telephone. The term TV is considered a colloquial form for television, so perhaps TP could have been used, if it were not already an acronym for something else.
no
Formal English is the English written in works like essays, where it's a standardized, formal way to write it, but informal English is what I'm writing in right now, a loose, not very structured way of writing.
The same way you talk to anyone on the phone. Have a conversation.
There was a new market in peer-to-peer prostitution. The telephone offered a quicker way for that. Today, this is known as phone sex.
By using the internet to run your phone you can get a years worth of phone service for as low as $19.95. The way it works is your telephone is actually ran through your computer and through the internet rather than through telephone lines. Internet phone service is much cheaper than a landline telephone service.
The best way to reset your phone answering service is to call your current provider and have them reset your phone from their end. Or you can also use your master reset button on your telephone to reset all information.
because instead of writing letters it was a much quicker way to communicate.
There are many more than two styles of writing, but one common way of a classifying styles is on a continuum ranging from very formal to very informal.
One way to tell if your phone line is an analog one line is to plug a telephone directly into the jack. If the phone works, the line is analog.
Ben 10 was a television show that is no longer in production, there is no way to contact them by telephone.
Too late: he's on his way.
"Ya" can function as a pronoun, specifically as a colloquial or informal way to say "you." It is often used in casual speech or writing.