Hello Rabocan
The quick answer is that it may work in your part of Texas. You have to get the correct model of phone but finding out if it will work in your area is the bigger issue to resolve.
Part 1: You have to get model Blu Life Pure model L240a. The "a" in the model stand for America and has all the Proper radios to work in a Re-farmed T-Mobile market. ( The L240i model stand for International.)
Part 2 What is a Re-farmed T-mobile market?. Re-farmed simply means that t-mobile has shifted around its 2G, 3G/Faux4G data to its 1900 Radio band. If you have the correct BLU model (with the "a") phone that supports the 1900 band and you live in a re farmed market you will be blessed with speeds on average of 1-7 MB down with people reporting higher after rooting and modding.
I can't tell you if the Lancaster, Texas area has been re-farmed / or updated. You may have to check forums like Google plus community for more info:
BLU Products Development Team - Community - Google+.
I made a video regarding Blu Products telephones running on T-mobile:
I made other videos regarding Blu products as well.
Just look for my videos on YouTube by searching"pdxrelentless blu studio 5.5" Or clicking the link above.
Anybody reading this is welcome to head over and review my Studio 5.5 you tube videos and in QA public discussions made on there.
Hope this helps you out.
Peace.