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.