No. Moreover, 'where' is not a question that enters the picture at all. The straps which bind the tefillin to the head or arm are different, so that each one in a set of two is worn only on the head or only on the arm. While there may be some differences in how they are tied and, in certain cases, the order of the verses inscribed on their parchments, there isn't any leeway about where they are worn. Phylactery is, I believe, of greek derivation, and tefillin of Hebrew. The first, singular, comes from a word for guard house, the second, 'plural,' comes from the word for prayer (it is plural for prayer, but singular for tefillin, I think). The Greek is the more accurate, since tefillin are not, in their origin, worn for prayer, per se, but during all daylight hours. And because as 'signs,' they are meant more or less as guardians of faith.
