[OnePlus 5T  ROMs, Kernels, Recoveries, & Other Dev] soichirosan:
logcat when com.android.phone crashed, it same as this oneplus 5 issue:

https://xdaforums.com/oneplus-5/development/rom-lineageos-15-1-oreo-oneplus-5-t3727228/page26/amp/

02-11 21:50:02.783 I/ActivityManager(1310): Displayed com.android.phone/.MobileNetworkSettings: +192ms

02-11 21:50:02.796 D/OpenGLRenderer(18737): endAllActiveAnimators on 0x7ebb298c00 (RippleDrawable) with handle 0x7ed9ba5d00

02-11 21:50:03.804 D/NetworkStats(1310): Resolving plan for NetworkTemplate: matchRule=MOBILE_ALL, subscriberId=460110..., matchSubscriberIds=[460110...]

02-11 21:50:03.805 D/NetworkStats(1310): Found active matching subId 1

02-11 21:50:03.809 D/NetworkStats(1310): Resolved to plan null

02-11 21:50:03.810 D/RecurrenceRule(19361): Resolving using anchor 2018-02-11T21:50:03.809+08:00[Asia/Shanghai]

02-11 21:50:03.811 D/RecurrenceRule(19361): Cycle 13 from 2018-02-10T00:00+08:00[Asia/Shanghai] to 2018-03-10T00:00+08:00[Asia/Shanghai]

02-11 21:50:03.813 D/NetworkSettings(19361): updateBody: isLteOnCdma=false phoneSubId=1

02-11 21:50:03.819 D/CdmaOptions(19361): deviceSupportsnvAnRum: prop=NV,RUIM

02-11 21:50:03.819 D/CdmaOptions(19361): deviceSupportsnvAnRum: nvSupported=true ruimSupported=true

02-11 21:50:03.819 D/CdmaOptions(19361): Both NV and Ruim supported, ENABLE subscription type selection

02-11 21:50:03.823 D/GsmUmtsOptions(19361): Not a GSM phone

02-11 21:50:03.824 D/NetworkOperators(19361): [NetworksList] getting network selection mode...

02-11 21:50:03.828 I/Telecom (1310): PhoneAccountRegistrar: SimCallManager queried, returning: null: TSI.gSCM@CN0

02-11 21:50:03.832 D/NetworkSettings(19361): isWorldMode=false

02-11 21:50:03.846 D/NetworkOperators(19361): [NetworksList] get network selection mode: auto selection

02-11 21:50:05.621 I/ActivityManager(1310): START u0 {act=android.intent.action.MAIN cmp=/} from uid 1001

02-11 21:50:05.622 D/AndroidRuntime(19361): Shutting down VM

02-11 21:50:05.623 E/AndroidRuntime(19361): FATAL EXCEPTION: main

02-11 21:50:05.623 E/AndroidRuntime(19361): Process: com.android.phone, PID: 19361

02-11 21:50:05.623 E/AndroidRuntime(19361): android.content.ActivityNotFoundException: Unable to find explicit activity class {/}; have you declared this activity in your AndroidManifest.xml?

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1940)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Instrumentation.execStartActivity(Instrumentation.java:1618)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Activity.startActivityForResult(Activity.java:4487)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Activity.startActivityForResult(Activity.java:4445)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Activity.startActivity(Activity.java:4806)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.Activity.startActivity(Activity.java:4774)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.preference.Preference.performClick(Preference.java:1153)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:249)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.widget.AdapterView.performItemClick(AdapterView.java:318)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.widget.AbsListView.performItemClick(AbsListView.java:1158)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.widget.AbsListView$PerformClick.run(AbsListView.java:3127)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.widget.AbsListView$3.run(AbsListView.java:4042)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.os.Handler.handleCallback(Handler.java:790)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.os.Handler.dispatchMessage(Handler.java:99)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.os.Looper.loop(Looper.java:164)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at android.app.ActivityThread.main(ActivityThread.java:6494)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at java.lang.reflect.Method.invoke(Native Method)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)

02-11 21:50:05.623 E/AndroidRuntime(19361):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

02-11 21:50:05.629 V/RescueParty(1310): Disabled because of manual property

02-11 21:50:05.630 W/ActivityManager(1310): Process com.android.phone has crashed too many times: killing!

02-11 21:50:05.630 W/ActivityManager(1310): Force finishing activity com.android.phone/.MobileNetworkSettings

02-11 21:50:05.637 I/WindowManager(1310): Failed to capture screenshot of Token{3aa30ee ActivityRecord{9856e69 u0 com.android.phone/.MobileNetworkSettings t362 f}} appWin=Window{5d6c252 u0 com.android.phone/com.android.phone.MobileNetworkSettings} drawState=4

02-11 21:50:05.672 I/ActivityManager(1310): Showing crash dialog for package com.android.phone u0