Answer | If phone connection issues with the T25 arise, troubleshooting may resolve the issue, or may provide insight as to what is causing the issue. Â This document describes how to troubleshoot phone connection issues with the T25.
The following troubleshooting steps are to be followed in sequence:
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No Telephony Service
- ​If telephony service has not been activated yet, please call 1-800-Xfinity (1-800-934-6489) to setup an account that includes telephony service.  Â
NOTE: If the current Comcast/XFINITY service is being migrated from a existing device, the current phone service and phone number will be transferred when the installation of the T25Â is completed.
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No Dial Tone
- Make sure all phones are on the hook and all cordless phone batteries are charged.
 - If available, try to plug a working wired phone into different jacks to find out if the problem is isolated to one phone or one jack.
 - If the Tel 1 LED is off, contact Comcast/Xfinity to activate the line or troubleshoot the phone service.
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Not Receiving Calls
- Check the ringer on the phone to make sure it is turned on.
 - If the phone rings a half ring on incoming calls, Call Forwarding may be activated.Â
 - Contact Comcast/Xfinity to troubleshoot the phone service.
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