for backgrounds, which cell phone carriers will charge as picture messaging?

I have t-mobile, but i only have a 400 text plan. this does not include picture messaging. can i still get a background for my phone free of charge?

If you use Mobicious to send ‘free’ content to your phone you will pay your standard messaging rates for text and/or picture messages that you receive. So the only cost to you would be your carrier’s cost for a picture message.