Actually I looked it up on the Hebrew:
And it shall be for (KI) a sign upon your hand, and for (KI) frontlets between your eyes; for by strength of hand YHWH brought us forth out of Egypt.'
The Shema, the Tefillin and Mezuzah
There are three times of prayer throughout the day: Shaharit (morning prayer), Minhah (afternoon payer) and Maariv (evening prayer). (Two of these correspond to the time of sacrifice at the Temple in ancient times.) These three times of prayer are mentioned in the Scriptures:
And when Daniel knew that the writing was signed, he went into his house--now his windows were open in his upper chamber toward Yerushalayim--and he kneeled upon his knees three times a day, and prayed, and gave thanks before his Elah, as he did
(Dan. 6:11 (6:10) HRV; Ps. 55:17)
Traditionally the Sh’ma is recited as part of the morning and evening payers in fulfillment of Deut. 6:4-7:
HEAR, O YISRA’EL: YHWH OUR ELOHIM, YHWH IS ONE.
And you shall love YHWH your Elohim with all your heart, and with all your soul, and with all your might.
And these words, which I command you this day, shall be upon your heart;
and you shall teach them diligently unto your children, and shall talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise up.
(Deut. 6:4-7 HRV)
(some see the phrase “when you sit in the house, and when you walk by the way” as pointing to the afternoon prayer as well)
According to the Jerusalem Talmud the reciting of the Shema repels the shedim (demons):
On what ground was it ordained that the Shema
should be recited at home in the evening?
to put harmful spirits to flight.
The Babylonian Talmud teaches that the Shema is like a two edged sword which repels the shedim (demons):
Whoever reads the Shema upon his bed is as though he holds
a two edged sword in his hand (to ward off evil spirits); as it
is said “Let the high praises of Elohim be in their mouth,
and a two edged sword in their hand” (Ps. 149:6)
This is much like what Paul says when he identifies the Word of Elohim with a two edged sword (Heb. 4:12) and lists it as part of the full Armor of Elohim by which we may be "able to stand firm against the tactics of the Akel Kartza" (Eph. 6:10-18)
And you shall bind them as a sign upon your arm, and they shall be as totafot between your eyes.
Tefillin are not even mentioned in the Torah. It is a first century tradition, a nice one, but not a mitzva.
"Totafot" is a word meaning "sign for remembrance"; there is no such thing in the Torah as "tefillin".
"“Therefore you shall lay up these words of mine in your heart and in your soul, and bind them as a sign on your hand, and they shall be as frontlets between your eyes."
It seems pretty evident that the WORDS of the entire TORAH are what is supposed to be bound and kept, in mind ("head") and in deed ("hand").
The same Rabbinical exegetical philosophy that finds meat and milk unmixable has replaced this admonition to keep all the Torah with a very narrow and literal command to bind leather straps on your body.
It wouldn't surprise me if this practice originated in heathendom.
I would say there are no physical phylacteries commanded to be used, ever.
The WORDS of the Torah are to be a sign of remembrance for us; the devarim and mitzvot are to be kept in mind ("head") and to be practiced ("hand") - no physical ritual of binding leather straps on your body is necessary, nor evident from the text.
I thought this article was very informative. Has great sources and was very objective.