Can I jailbreak ios 7.1 on my iPhone 4s?

I have an Iphone 4s, unlocked with T-Mobile running on ios 7.1.

Is there an untethered jailbreak I can do and will I still be unlocked to use T-Mobile

Yes you certainly can! That's something I'm very familiar with, since I do it all the time as part of my business. If you'd like help with it, just shoot me a message! (enable email communication in your Answers preferences first so that I can reply)

Thanks but I already did it before you answered that question.