Inspire Sim-Swap with current SIM?

I am eligible for an early upgrade from a device that uses the smart phone unlimited. If I do an early upgrade ($200 extra, $300 total), will I be able to continue to swap my SIM between devices?

I have heard that I will need a new 4G SIM for the Inspire. If that is true, will I still be able to use this new 4G SIM backwards in to 3G devices?

Thanks much.

Obviously, lie many of you, I dont want to lose the advantage of GSM devices and that is the ability to simply swap my sim to whatever phone matches my outfit of the day : )

Thanks.

 

Priorities, Priorities. I guess when you are 40+, Miley Cyrus turning 18 doesnt hold as much value or hope.

Anyone else?

Thanks again.

 

To add another wrinkle.. The line I am going to do my early upgrade on has the Blackberry Enterprise Unlimited Data plan ($45). I am hoping they will not force me to change that plan and they will activate the new 4G SIM with the same BB Enterprise plan so that I can use in my current devices?

Thanks.

 

Yes I was. They told me over and over again that I could not and I would need to swap to a different plan. I was able to convince him that once I got home if it did not work, I would call and swap plans.

Since we are not on a true 4G yet, it still uses the CINGULARWAP.COM APN. Blackberry uses that as well for data. So all is good.

Hope this helps.