Are Tmobile using bogus DoD IP addresses (bogons)?
Some large ISPs/cell providers have been known to be assigning reserved IP addresses (i.e. IP address that does not belong to the private addresses) to devices in their network. Many organizations (government and universities) that participated in the early days of the Internet owned very large blocks of IP address that aren't being used, and their IP addresses are suspect to this sort of misuse.

The reason they did this is usually because they run out of supply for private IP addresses. This workaround is violating all kinds of standards, but it is generally safe as long as nobody in their network need to access a server using those reserved IP addresses, and since these IP addresses are unused by their owner anyway, nobody really cared to do anything about it.

btw, my superintendant told me to told you to not worry about the men in black suits in front of your residence, they're gardeners.