Apple Installing LTE Equipment in Apple Store

Donald Melanson, Engadget:

Now we’ve received an image the image you see above, which shows some 4G LTE equipment that was recently installed in a major Apple store — by AT&T, according to our source.

Why would Apple install LTE equipment in its Apple Store? Perhaps to perform controlled tests for LTE equipment. This way future prototypes, say a LTE iPhone, can be tested in the wild but be perfectly controlled.