If a person has access to only the tefillin shel yad or only the tefillin shel rosh, he wears the tefillin he has, with a berachah. If he has only the tefillin shel yad, he wears it and recites the usual berachah of להניח תפילין. If he has only the tefillin shel rosh, he wears it and recites the berachah of על מצות תפילין. This also applies to a person who has a complete pair of tefillin but cannot wear either the shel yad or the shel rosh due to a bandage and the like.[102]

1) If he anticipates having access to the other tefillin before the final time for reciting Shema, then he should not wear the tefillin that he has until the other arrives, when he can put them on together.[103]

2) If a person has only a tefillin shel yad of Rashi and a shel rosh of Rabbenu Tam, then he wears both and re cites the berachah over the shel yad, as usual. If, however, he has only a shel yad of Rabbenu Tam and a shel rosh of Rashi, then he places the shel yad without reciting a berachah, and then places the shel rosh with the berachah of על מצות תפילין.[104]

(For the halachot concerning a person who has only tefillin Rabbenu Tam, see the section entitled “The Proper Time for Wearing Tefillin”).