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aluminum
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09/07/2026 2:24 AM

Can I use a rented voice modem with a user owned data modem

Subject pretty much says it.  I have two modems using a splitter: a voice modem is rented from Xfinity for the Voice service and a data modem (user owned) is used for ... data.  I want to replace the data modem with a newer, DOCSIS 3.1, high speed modem.  Can I use the old voice modem and just swap out the data modems?  

I realize that replacing both the modems at this point with a new voice/data modem would save me the rental fee of the current voice modem but there are no voice/data modems available that are on the current Xfinity compatibility list.  If I can upgrade the data modem, I can get better data speed (since I am currently paying for it but cannot take advantage of it with my current DOCSIS 3.0 modem).  I am trying to verify my options before I proceed.

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1 month ago

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XfinityVictor

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2 months ago

 

aluminum has any one addressed your modem concern?

 

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aluminum

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41 Messages

No.

I have contacted Xfinity and tried to update the data modem to an Arris T34 but the Xfinity agent could not seem to understand that I did not want to update my voice modem.  They wanted the eMTA MAC off of the voice modem but, when they realized that this was a separate device, they stopped the activation and said that I needed one device with both a data port (Ethernet) and a voice port.  Even though I am currently using separate devices.  The current setup works but I cannot take advantage of higher data speeds with my current data modem.

(edited)

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2 months ago

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XfinityAirelle

Official Employee

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aluminum Sorry about that! Yes, you can generally keep the rented modem provisioned for Xfinity Voice only and replace just your customer-owned internet modem. Your new DOCSIS 3.1 modem will need to appear as compatible with your address and speed tier in Xfinity’s Device Info tool.

 

When activating the replacement, make sure only the internet modem is swapped and the rented voice modem remains active on the account for phone service. If the Xfinity app does not handle the two-device setup correctly, our team can help review the provisioning before any equipment is removed.

 

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2 months ago

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aluminum

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Thank you for the prompt response.  I will make another attempt over the next couple of days and will keep you posted.

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2 months ago

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XfinityAmira

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Of course, that sounds good, aluminum. We look forward to hearing back from you. 

 

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Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
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2 months ago

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BruceW

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2 months ago

@aluminum wrote: "... update the data modem to an Arris T34 ..."

Note that T34 does not appear to be a valid Arris model number. Perhaps you meant "S34"?

Follow the "See all modems" link near the bottom of https://www.xfinity.com/support/internet/customerowned, and then check the devices listed under the "Compatible modems for enhanced speeds" heading.

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aluminum

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You are correct, sir.  S34

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2 months ago

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aluminum

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I successfully activated the new Arris S34 without affecting my voice service on my current (but very old) voice modem.  The agent that I got seemed to understand exactly what I wanted to do and did it.  I was up and running in about 10 minutes without interruption of my TV or voice service.  I will keep the old voice modem (which I rent from Xfinity) because it works and I have come to believe that replacements are either not available or not dependable.

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1 month ago

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XfinityEmilyB

Official Employee

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3.2K Messages

 

aluminum Thank you for getting back to us here to let us know that you were able to activate the new data modem while keeping your voice modem working! I'd like to review your account and make sure you have the perfect promotion for your household needs. 
Please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the direct messaging icon located at the top right of this forums page.
How to Send Us a Direct Message: https://forums.xfinity.com/conversations/guidelines/how-to-direct-messaging-within-the-forum/697ba1e570934d009185c514
1. Click "Sign In" if necessary.
2. Click the "Direct Messaging" icon.
3. Click the "Start new conversation" (pencil and paper) icon. 
4. In the "To:" line, type "Xfinity Support".
5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list.
6. An "Xfinity Support" graphic will replace the "To:" line.
7. Type your message in the text area near the bottom of the window.
8. Press Enter to send it. 

 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please mark as Best Answer.tick

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1 month ago

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