Im interested to know if its possible to create subdomain service without setting up own hosting ? For example if I buy paying hosting with enough space.. is it possible in that case ? What are the negative sides of this thing and are there any positive things of it also ? does the hosting company usually have problem with this ??

A subdomain service is separated from webhosting. A subdomain points to an URL or an IP address which you will configure upon creating your subdomain. Hence if you don't have a webhost, you basically points to nothing. Your subdomain therefore goes to no sites. It is however perfectly alright to sign up for a subdomain, but it's not logical to have a subdomain that points to nothing.

By subscribing to a subdomain without pointing to your own webhost, you will park that domain until you point that to your webhost. However, do read the terms and conditions of your subdomain provider as some of them don't allow domain parking. It is a must to point to a URL as one can signup for multiple URLs that points to nothing, while others cannot use the same domain. Most providers disallow such thing, hence you have to point to a webhost.

well the only negative thing I really see about sub domain hosting is that their are litterally thousands of subdomain services out there. You would basically would have to be another trap17 or astahost with great packages and better offers the the other people.

of course having a real long url like myhosting.yoursite.com.haha is just annoying as well.

Thats Funny.