[Nexus 6P Q&A, Help & Troubleshooting] dratsablive:
I am on AT&T and the tether edit works for me. Below is my build.prop to examine.

#

# PRODUCT_OEM_PROPERTIES

#

import /oem/oem.prop ro.config.ringtone

import /oem/oem.prop ro.config.notification_sound

import /oem/oem.prop ro.config.alarm_alert

import /oem/oem.prop ro.config.wallpaper

import /oem/oem.prop ro.config.wallpaper_component

import /oem/oem.prop ro.oem.*

import /oem/oem.prop oem.*

# begin build properties

# autogenerated by buildinfo.sh

ro.build.id=NMF26F

ro.build.display.id=NMF26F

ro.build.version.incremental=3425388

ro.build.version.sdk=25

ro.build.version.preview_sdk=0

ro.build.version.codename=REL

ro.build.version.all_codenames=REL

ro.build.version.release=7.1.1

ro.build.version.security_patch=2016-12-05

ro.build.version.base_os=

ro.build.date=Tue Nov 1 18:24:37 UTC 2016

ro.build.date.utc=1478024677

ro.build.type=user

ro.build.user=android-build

ro.build.host=wpds15.hot.corp.google.com

ro.build.tags=release-keys

ro.build.flavor=angler-user

ro.product.model=Pixel XL

ro.product.brand=google

ro.product.name=angler

ro.product.device=angler

ro.product.board=angler

# ro.product.cpu.abi and ro.product.cpu.abi2 are obsolete,

# use ro.product.cpu.abilist instead.

ro.product.cpu.abi=arm64-v8a

ro.product.cpu.abilist=arm64-v8a,armeabi-v7a,armeabi

ro.product.cpu.abilist32=armeabi-v7a,armeabi

ro.product.cpu.abilist64=arm64-v8a

ro.product.manufacturer=Huawei

ro.product.locale=en-US

ro.wifi.channels=

ro.board.platform=msm8994

# ro.build.product is obsolete; use ro.product.device

ro.build.product=angler

# Do not try to parse description, fingerprint, or thumbprint

ro.build.description=angler-user 7.1.1 NMF26F 3425388 release-keys

ro.build.fingerprint=google/angler/angler:7.1.1/NMF26F/3425388:user/release-keys

ro.build.characteristics=nosdcard

# end build properties

#

# ADDITIONAL_BUILD_PROPERTIES

#

ro.config.ringtone=Titania.ogg

ro.config.notification_sound=Tethys.ogg

ro.config.alarm_alert=Oxygen.ogg

ro.com.android.dataroaming=false

ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html

ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html

ro.com.google.clientidbase=android-google

ro.carrier=unknown

ro.com.android.wifi-watchlist=GoogleGuest

ro.error.receiver.system.apps=com.google.android.gms

ro.setupwizard.enterprise_mode=1

ro.atrace.core.services=com.google.android.gms,com.google.android.gms.ui,com.google.android.gms.persistent

ro.retaildemo.video_path=/data/preloads/demo/retail_demo.mp4

ro.com.android.prov_mobiledata=false

ro.opengles.version=196610

ro.sf.lcd_density=560

persist.hwc.mdpcomp.enable=true

persist.data.mode=concurrent

persist.radio.data_no_toggle=1

persist.radio.data_con_rprt=true

ro.hwui.texture_cache_size=72

ro.hwui.layer_cache_size=48

ro.hwui.r_buffer_cache_size=8

ro.hwui.path_cache_size=32

ro.hwui.gradient_cache_size=1

ro.hwui.drop_shadow_cache_size=6

ro.hwui.texture_cache_flushrate=0.4

ro.hwui.text_small_cache_width=1024

ro.hwui.text_small_cache_height=1024

ro.hwui.text_large_cache_width=2048

ro.hwui.text_large_cache_height=1024

vidc.debug.perf.mode=2

vidc.enc.dcvs.extra-buff-count=2

ro.min_freq_0=384000

ro.vendor.extension_library=libqti-perfd-client.so

rild.libpath=/vendor/lib64/libril-qc-qmi-1.so

ro.telephony.default_cdma_sub=0

ro.telephony.default_network=10

telephony.lteOnCdmaDevice=1

persist.radio.mode_pref_nv10=1

persist.radio.apm_sim_not_pwdn=1

persist.radio.custom_ecc=1

persist.data.iwlan.enable=true

ro.frp.pst=/dev/block/platform/soc.0/f9824900.sdhci/by-name/frp

persist.radio.always_send_plmn=true

ro.telephony.call_ring.multiple=0

af.fast_track_multiplier=1

audio_hal.period_size=192

ro.qc.sdk.audio.fluencetype=fluence

persist.audio.fluence.voicecall=true

persist.audio.fluence.voicecomm=true

persist.audio.product.identify=angler

persist.audio.fluence.speaker=true

media.aac_51_output_enabled=true

ro.audio.monitorRotation=true

ro.audio.flinger_standbytime_ms=300

persist.sys.ssr.restart_level=ALL_ENABLE

persist.camera.eis.enable=1

persist.camera.is_type=4

dalvik.vm.boot-dex2oat-threads=4

dalvik.vm.dex2oat-threads=4

dalvik.vm.image-dex2oat-threads=4

persist.radio.redir_party_num=0

dalvik.vm.heapstartsize=8m

dalvik.vm.heapgrowthlimit=192m

dalvik.vm.heapsize=512m

dalvik.vm.heaptargetutilization=0.75

dalvik.vm.heapminfree=512k

dalvik.vm.heapmaxfree=8m

keyguard.no_require_sim=true

drm.service.enabled=true

ro.setupwizard.rotation_locked=true

ro.facelock.black_timeout=700

ro.facelock.det_timeout=2500

ro.facelock.rec_timeout=3500

ro.facelock.est_max_time=600

persist.sys.dalvik.vm.lib.2=libart.so

dalvik.vm.isa.arm64.variant=cortex-a53

dalvik.vm.isa.arm64.features=default

dalvik.vm.isa.arm.variant=cortex-a53.a57

dalvik.vm.isa.arm.features=default

net.bt.name=Android

dalvik.vm.stack-trace-file=/data/anr/traces.txt

ro.build.expect.bootloader=angler-03.62

ro.build.expect.baseband=angler-03.78

ro.expect.recovery_id=0xa06ce1e21c6cbfa631928f28252f1aaa60bd9f8b000000000000000000000000

ro.opa.eligible_device=true

net.tethering.noprovisioning=true