I am an owner of a Sprint pc cell phone model TP1100,id.FFMSP510
ESN DEC 11707268910
ESN HEX 756EEA35 
Is there a code I can use to un-lock the phone since it wont work in the 
location I am now in?

I have not been able to find a code specifically, but it seems that
you are not the only person looking for such information. There is a
web forum specifically devoted to this sort of thing, and they have a
discussion area for Sprint PCS phones, where questions similar to
yours have been posted, this may be worth some investigation on your
part, but I was unable to find any specific codes there.

CellPhoneHacks.com - Sprint PCS Forum
http://www.cellphonehacks.com/viewforum.php?f=11

You should be aware that entering control codes into your phone
without being directed to do so by Sprint may breach their terms,
invalidate your warranty, and possibly damage the phone - proceed at
your own risk!

Regards,
sycophant