I'm not a techie type so I want to see if I can get some feedback. My dB readings using open signal maps are 10 dbs lower than what the stock settings read. Phone says 109 dbs, open signal maps says 97 dbs. Which one should I trusted the true reading? Also, when a phone reverts between 3g and 4g, what triggers the switch? (are the signal bars for show?) is there a dbs number the phone reaches that makes it switch to 3g. Any help or thoughts are appreciated.