Iphone LTE Signal level dbm threshold fall back to 3G or 2G

[cellulartalk]

Does anyone know at what dbm signal level LTE will fall back to a legancy technology 3G, 2G i.e. -120dbm???? I constantly see in low signal areas LTE signal reverts back 3g or 1x on verizon or sprint. T-mobile and ATT to 4G..... its becoming beyond ridiculous these days since LTE is...

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