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I believe it depends how you saved the new contacts to your device. Did you save it as a T-mobile contact or google contact? In any case you can enable the option of viewing both types of contacts by clicking the MENU BUTTON when viewing your contacts. Then check whichever boxes (T-mobile, Google, Yahoo, Facebook, Video Chat, Sim, Phone) you would like to show up in your contact book.
For my personal ease and preference, whenever I save a new contact, I keep them saved under T-mobile just because whenever I create a new contact, T-mobile is already the default option it is set as. Then for what types of contacts I have viewable for my Contact book, I have just T-mobile and Video Chat enabled.