1. tdscdma_op_plmn_list
<NvEfsItem fullpathname="/nv/item_files/modem/nas/tdscdma_op_plmn_list" name="UNKNOWN" mapping="direct" encoding="dec" index="0">4,100,240,0,100,240,32,100,240,112,100,240,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0</NvEfsItem>
4,100,240,0,100,240,32,100,240,112,100,240,128，改成16进制是
0x03 0x64 0xf0 0x00 0x64 0xf0 0x20 0x64 0xf0 0x70 0x64 0xf0 0x80
参考：http://www.cnblogs.com/bastard/archive/2013/05/09/3068602.html，里面提到0x03 0x64 0xf0 0x00 0x64 0xf0 0x20 0x64 0xf0 0x70 (46000, 46002, 46007)
那么整个代表：4项，分别是 46000, 46002, 46007, 46008
NV65602：Location – /nv/item_files/modem/nas/ehplmn
Default value – 0x03 0x64 0xf0 0x00 0x64 0xf0 0x20 0x64 0xf0 0x70 (46000, 46002, 46007)
NV70189：Location – /nv/item_files/modem/nas/ tdscdma_op_plmn_list
Default value – 0x03 0x64 0xf0 0x00 0x64 0xf0 0x20 0x64 0xf0 0x70 (46000, 46002, 46007)
Modem代码中处理与PLMN相关的函数：
reg_sim.c ：reg_sim_read_ehplmn_list
2. rat_acq_order
公司解决通话M无法接听问题，这个NV项调整为
<NvEfsItem fullpathname="/sd/rat_acq_order" name="UNKNOWN" mapping="direct" encoding="dec" index="0">0,8,0,6,9,11,3,5,2,4,0,0,0,0</NvEfsItem>
搜索代码，找到pdsm_stubs.h
SYS_SYS_MODE_NONE = -1, /* FOR INTERNAL USE ONLY! */
/** @endcond
*/
SYS_SYS_MODE_NO_SRV=0,
/**< No service; NV_MODE_INACTIVE. */
SYS_SYS_MODE_AMPS=1,
/**< Analog Mobile Phone System (AMPS) mode. */
SYS_SYS_MODE_CDMA=2,
/**< CDMA mode. */
SYS_SYS_MODE_GSM=3,
/**< GSM mode. */
SYS_SYS_MODE_HDR=4,
/**< HDR mode. */
SYS_SYS_MODE_WCDMA=5,
/**< WCDMA mode. */
SYS_SYS_MODE_GPS=6,
/**< GPS mode. */
SYS_SYS_MODE_GW=7,
/**< GSM and WCDMA mode. */
SYS_SYS_MODE_WLAN=8,
/**< WLAN mode. */
SYS_SYS_MODE_LTE=9,
/**< LTE mode. */
SYS_SYS_MODE_GWL=10,
/**< GSM, WCDMA, and LTE mode. */
SYS_SYS_MODE_TDS=11,
/**< TDS mode. */
结合代码
0,8,0,6,9,11,3,5,2,4,0,0,0,0 大概这么理解：8项，NO_SRV, GPS, LTE, TDS, GSM, WCDMA, CDMA, HDR。好像是网络搜网次序。TDS估计是TDSCDMA，那就是除了GPS，然后4G/3G/2G（对移动而言）。
函数qmi_nasi_sys_sel_pref_ind，。