I want you to be able to manage your account the way you should be able to! Are you getting a specific error message when submitting the change? Are you able to make the change when calling into customer service? Do you typically change back to the Nexus the same night after activating Blackberry? I am eager to review your response so we can find a solution.
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Thank you for the reply. I do not receive an error message. After inputting the SIM card number in, it goes to a new page telling me a new single line plan is required and I have to choose minutes, text messages, etc (I'm on a family plan, not single line). The customer service reps in store and on the phone are able to activate the SIM card without any issues. Timing didn't seem to matter much. It could have been days or weeks between phone swaps and I would still have the same problem.
However, just the other day I received a new SIM in the mail and I was able to successfully activate it through the website. So maybe there was just a hiccup in the process that has now been resolved. I guess I won't really know for sure until I switch around my phones again.
If I run into the same issue I'll be sure to come back and report it. Thanks again for the help!