IPhone 5. 3G symbol changes to circle to LTE and back again?

I have an iPhone 5 with Sprint in an area that does not have 4g lte. (Detroit)

However today my 3G icon has been changing to a circle icon to an LTE icon, then back to 3G.

I restarted my phone and this is still happening.

Could this mean they are in the process of upgrading my area to LTE?

Yes, you could be at the border of an area that has LTE.

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