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Also (as I learned on this forum soon after I got my first 4G phone) the number of bars only indicates voice signal strength, not data. 4G or 3G only show up as on or off. (3G does have that lovely little D under it sometimes, which I believe stands for Dysfunctional, or Dropped, or Defunct, or Dead, or something).
budone's suggestion may give you more actual information.
