Same problem for a ZTE modem in LTE mode:

modem-manager[29629]: <debug> [1349262318.552754] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): --> 'AT+ZPAS?<CR>'
modem-manager[29629]: <debug> [1349262318.568652] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): <-- '<CR><LF>+ZPAS: 
"4G","PS_ONLY"<CR><LF><CR><LF>OK<CR><LF>'
modem-manager[29629]: <debug> [1349262321.803912] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): --> 'AT+CIND?<CR>'
modem-manager[29629]: <debug> [1349262321.827096] [mm-at-serial-port.c:334] 
debug_log(): (ttyUSB3): <-- '<CR><LF>+CIND: 
5,0,1,1,0,0,1,2<CR><LF><CR><LF>OK<CR><LF>'

giving signal quality 0 even though it is quite good signal.

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https://bugs.launchpad.net/bugs/1060831

Title:
  Sierra/ZTE LTE modem gives no signal quality in LTE mode (only in
  3G/2G mode)

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