First -- Thank you all!! Reading through these threads have been a nightmare, BUT -- I still have my unlimited plan. On a side note -- the process made sense right away, but reading every scenario was frustrating because it started confusing me. Long story short, it was worth it. I have Family Share 700; two lines, both eligible for upgrade, one smart #1 (unlimited) and one basic #2. Here's my scenario, hope it's helpful:
1) Ordered GS4 on-line. (Comcast had a $200 prepaid visa offer on a $199 phone. Initiated online via Comcast, which took me to VZW where I upgraded the basic, #2.)
2) Received the GS4, (with new SIM) activated on the basic line, no problem.
3) Transferred the GS4 from the basic. (Select manage device (basic), Activate or switch, continued through prompts, activated using *228 and basic was back -- GS4 was free.)
4) Now, Activate or switch on the old smart phone #1. Activate device previously used...selected my old smart phone, #1 from drop down, continued through prompts, (make sure Unlimited is highlighted in blue) and confirm. The GS4 was activated with the unlimited plan, life is beautiful!
Couple footnotes:
1) Write down the SIM card #. When activating old smart phone (item 4 above) it prompted me to add new SIM card (which was in the phone) or SIM card #, that I had written down. One of the posters suggested this which was very helpful.
2) Don't use *228 to activate the old smart phone, just power off and on. This last piece made me nervous, as it took about 15min to complete.
Once again, thank you all!!!