What does this do for Vb

[Jolly Jack]

Q. Why I can not run functions mail() and phpinfo()

A. For security reasons those functions and all sockets functions are disabled. Please do not use it in your PHP programs.

I am runing a small forum for the first time and until i get it all sorted i am on a free host called coolfreepages, but this was in FAQ, i understand that the mail() means i cannot use any mail function link signup etc what does the phpinfo() prevent me from doing.

I can not attach anything aswell could this be a reason, thats files or upload avatar.

Does anyone know of a free site that would be better until iam sorted then i plan on paying, dont want to waste money if i give it all up.