I have personally downloaded a large collection of ringtones and manually uploaded them to my phone using a transfer cable I bough on ebay. With bluetooth, you don't really even need the wire these days
Finding ringtones is generally the easy part, simply google Free Ringtones and you come up with a number of good hits, the hard part is figuring out the best way for you to get them on your phone.
http://cellphones.about.com/cs/originalringtones/has some ring tones that you can put on a T-Mobile phone.
Getting them on your phone can be easy or tricky depending on the phone model you have. The following suggestions comes from
http://cellphones.about.com/od/freeringtonesbycarrier/a/bc_t-mobile.htm Free T-Mobile Ringtones Strategy #1: About.com's wap download system
Simply choose a compatible T-Mobile ringtone (go back to Step #1) and click on "Download it for free" then follow instructions. Enter your carrier and cell phone brands and you will get a number of suggestions on how to download that T-Mobile ringtone for free. Most of the time, it will include WAP download. From there, just follow instructions.
Free T-Mobile Ringtones Strategy #2: Infrared or Bluetooth
If your T-Mobile cell phone is equipped with either Bluetooth or Infrared and your PC or laptop is so-equipped, you can follow those easy steps to transfer ringtones for free:
# Choose a free T-Mobile ringtone (See Step #1)
# Instead of clicking "Download it for free", right-click the "Listen" link and select "Save As" to save that free ringtone to your computer hard drive
# Following your cell phone's owner's manual instructions, connect your computer to your T-Mobile cell phone using Bluetooth or Infrared
# Transfer your new free ringtone to your T-Mobile cell phone
# From your T-Mobile cell phone's menus, assign the newly transfered ringtone to your phone's ringtones (the technique will vary from phone to phone)
* If your T-Mobile cell phone allows it, you can also do that with any mp3 or compatible music file.
Free T-Mobile Ringtones Strategy #3: Using a Memory Card
Many cell phones feature a small memory card reader. Maybe your T-Mobile cell phone does. And if your computer also has a card reader (most laptops sold after 2004 do), then you may simply use a memory card to transfer free ringtones to your T-Mobile cell phone. Here is how:
# Choose a free T-Mobile ringtone (See Step #1)
# Don't click "Download it" but right-click the "Listen" link and select "Save As" to save it to your computer
# Transfer the ringtone to your memory card
# Insert the memory card in your T-Mobile cell phone
# Transfer your new free ringtone to your T-Mobile cell phone's memory
# Assign your newly transfered T-Mobile ringtone to your cell phone's ringtones (the technique will vary from phone to phone)
