Make sure you have all drivers updated.
No, TF2 is not playable on a phone
TF2 is free-to-play
No, it'll pause instead. You have to play the game to unpause it.
At http://www.systemrequirementslab.com/referrer/srtest you can test all games on your computer.
Any laptop will support TF2 as long as the computer can run it. You can find the requirements in the related link.
You cant...
Yes. TF2 is a GREAT game, and I recommend you "buy" it. TF2 is now free to Play.
Seeing as those are low end games in terms of requirements. Any decent computer should be able to handle those. Shouldn't cost you no more then $700
no
I think so. I have bought a windows 7 PC, and i could install, launch and play tf2. I couldn't cantact any servers, but i cant do that on my xp too. so it should work. good luck!
Check if your graphics card is good enough to run the game, if not check the download help for more help.
No, TF2 does not have any single-player. You can play on servers with random people or your steam friends