The "newest" radio is not necessarily going to give you the best reception. Its a trial and error process, as the biggest variable is your exact location compared to your local cell towers. Although the newest is not a bad place to start, you may have to try several radios before you decide which is the "best" for you.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)