From the manual pages 5 and 6:
gsmctl -K is AT+QENG="servingcell" -> In the case of LTE Cat M1/Cat NB1 mode:
+QENG: "servingcell",<state>,"rat",<is_tdd>,<mcc>,<mn
c>,<cellid>,<pcid>,<earfcn>,<freq_band_ind>,<ul_bandw
idth>,<dl_bandwidth>,<tac>,<rsrp>,<rsrq>,<rssi>,<sinr>,
<srxlev>
and gsmctl -I is AT+QENG="neighbourcell" -> In the case of LTE Cat M1/Cat NB1 mode:
[+QENG: "neighbourcell intra","rat",<earfcn>,<pcid>,<rs
rq>,<rsrp>,<rssi>,<sinr>,<srxlev>,<cell_resel_priority>,<
s_non_intra_search>,<thresh_serving_low>,<s_intra_se
arch>