I have a Verizon iPhone 4 with the Unlimited data plan. I occasionally add the Personal Hotspot feature when needed when I go out of town, etc. Will I stay grandfathered on Unlimited data if I have the tethering plan after the July cut-off date? Specifically, there are several clarifications that are needed: With the premise that I currently have the Unlimited data plan: 1) If I add the $20/mo tethering Hotspot option *after* the July introduction of tiered data plans, can I continue to stay grandfathered into Unlimited with the tethering feature enabled? If the answer is NO, then: 2) If I add the tethering plan now before the July date, can I then keep the Unlimited data and would I have to keep it on my plan indefinitely?