i recently bought 3 optimus t from t-mobile as upgrade for my wife and kids and got 1 burgundy and 2 titanium. the 2 titanium have wifi calling while the burgundy does not. i check the version of software and found out they have different versions but both colors are already updated when i tried to update them. the titanium is ending in "l" while the burgundy is "h" are there any other differences that i should be aware of other than this, my wife keep asking why hers (the burgundy) is different from our kids please advise. thanks.