Actually it can happen much quicker. It just depends on how good of a jib the install team did, everything hook up and installed properly. It also depends on if they are just going to do lte, 3g, 800 or all three at once. I'd guess in urban areas they will do lte first then do 3g just because 1900 voice is fine in most urban areas. But that's just a guess on the later part.
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