There's a little glossy 2 page booklet that's in the box; which I quickly tossed aside when I removed it from the packaging.
I finally looked at it, and these steps seem to be the secret to my success:
- Ignore step 1 or you will have that stupid backup assistant program that is unnecessary on an Android phone.
- Make sure TB is powered down and the SIM card is removed.
- Dial 877.807.4646 - from any phone - to activate your 4G LTE service. It also says to have your customer receipt ready because you will be asked to conform the information on it - including the mobile number assigned to the LTE SIM card.
- Insert SIM card and then power up. It will then go through the activation process.
- Get that battery cover put back on - or you'll see the phone stuck in 1x.