Highest ive recieved is 8. It definietely depends on if 4g is in your area and how much its being used. I used to work for at&t and know that your H plus symbol will always show regardless on if they dont have the back haul on that tower because every towers software has been updated to handle.the speeds once the additional backhaul is in place. at&t is agressively adding 3g coverage and backhaul so eventually it will get better but right now there also trying to roll out LTE to compete with verizons very agressive launch
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