Overview:
HTC Checkin is the service responsible for “checking in” to HTC.  Recovery/Boot/Kernel Logs, Apps Updated/Crashed and mobile data amounts are sent off automatically.  The service also checks for Over-The-Air Updates.

How it works:
App responsible:
/system/app/CheckinProvider.apk

Data is written to:
/data/data/com.android.providers.htcCheckin/databases/htcCheckin.db

Data is sent to:
Values in /system/build.prop.

# For FOTA setting (leave empty value to use default)
ro.htc.checkin.url = http://andchin.htc.com/android/checkin
ro.htc.checkin.crashurl = http://andchin.htc.com/android/crash
ro.htc.checkin.url_CN = http://andchin.htccomm.com.cn/android/checkin
ro.htc.checkin.crashurl_CN = http://andchin.htccomm.com.cn/android/crash
ro.htc.checkin.exmsg.url = http://fotamsg.htc.com/android/extra/
ro.htc.checkin.exmsg.url_CN = http://fotamsg.htccomm.com.cn/android/extra/
ro.htc.appupdate.url = http://apu-chin.htc.com/check-in/rws/and-app/update
ro.htc.appupdate.url_CN = http://apu-chin.htccomm.com.cn/check-in/rws/and-app/update
ro.htc.appupdate.exmsg.url = http://apu-msg.htc.com/extra-msg/rws/and-app/msg
ro.htc.appupdate.exmsg.url_CN = http://apu-msg.htccomm.com.cn/extra-msg/rws/and-app/msg