interent

I have D Link DSL-2520U router it has two ports lan port and usb port . lan port is connected with my desktop computer , and usb port is free . now in the absence of mine my younger brother uses to connect the internet through usb port in his tablet and laptop and crossed the internet...

my friend has a phone but not of gprs i have many ringotnes on my computer and i have intenet can i send ringtones through sms using the interent for free on his mobile ? if yes then how ? plz help