If you want to send quick SMS to any mobile number in any part of the world using internet free of cost and without any time consuming registration process, you should use text4free.net website. I tested text4free website, i found that sms receives with too much delay.
The most powerful website for sending free text message is jaxtr.com . The only problem is that, it require registration process, If you are really not in the mood for registration, you should use mailinator.com. You just fill the email address with any mailinator.com email like email@example.com. After filling email, open mailinator.com and check mail for your email (like firstname.lastname@example.org).
jaxtr.com sends sms in very quick time and totally free. you must use it. Bulk sms or mms sending is not possible with jaxtr.com