How Can I Get Free Ringtones To My Phone With No Internet?

okay, i have this pre-paid T-Mobile phone, and the ringtones u can buy on its ‘website’ are like, 10 seconds long, and they repeat over and over, and they’re effin annoying and $3.00!
so uh, how can i send myself a ringtone to my phone?
with no internet, cause my phone is stupid…