The By the Gig mobile plan is only available to customers who joined Xfinity Mobile before April 22, 2026. If you already have By the Gig, don’t worry — nothing is changing for you. You can still manage your By the Gig lines anytime in the Xfinity app or at xfinity.com/mobile.
If you stay on your current pricing plan and remove all your By the Gig lines or switch them to an Unlimited plan, you’ll need to contact us if you want to go back to By the Gig.
If you move to the latest pricing plan, your By the Gig lines must be changed to either Mobile Select or Mobile Plus* and you will not be able to move back to By the Gig pricing because the plan is not available on our latest pricing plan.
*Service availability varies by location.
Are there any restrictions to changing my data amount?
You can change your data amount as often as you’d like during your billing cycle. You’ll be charged for the data amount you have at the end of the cycle.
The only restriction is that you can’t switch to a smaller data amount if you’ve already used more data than that amount includes.
- For example, if you have a 10 GB option and have already used 7 GB, you can’t switch down to a 3 GB option.
If your Xfinity Mobile account was opened on or after April 15, 2025 but before April 22, 2026, and you haven’t moved to the latest pricing plan, you have one By the Gig option with 1 GB of shared data. If you use more than 1.2 GB in a month, your usage is rounded up to the next whole GB, and you’ll be charged $20 for each additional GB.
If your account was opened before April 15, 2025 and you haven’t upgraded to a newer pricing plan, you can choose from three By the Gig data amounts.
- If you’re using less data, you can move to a smaller amount.
- If you’re using more, you can move to a larger amount.
These options stay available as long as you remain on your current pricing plan.
How do I change my data amount?
Xfinity Mobile online account
- Log in to your Xfinity Mobile account online with the Primary or Manager’s Xfinity ID.
- Select a line from your Activity page.
- Select Manage to By the Gig.
- Select the amount you'd like to change to.
- Confirm the change.
- If the change doesn't occur immediately, we'll email you when it does.
- It should take effect within 24 hours.
- Your data usage will carry over to the new amount.
Xfinity app
- Log in to the Xfinity app with the Primary or Manager’s Xfinity ID.
- Select the Services tab.
- Select the Mobile lines and data usage located within the Mobile services card.
- Select Change shared data.
- You may be required to sign in again.
- Select the amount you'd like to change to.
- Confirm the change.
- If the change doesn't occur immediately, we'll email you when it does.
- It should take effect within 24 hours.
- Your data usage will carry over to the new amount.
Additional information
Visit our Online Support Center to find common solutions.
The easiest way to activate, manage, and troubleshoot your Xfinity experience is with the Xfinity app! Get 24/7 real-time support, pay your bill, view plan details, get outage updates, and more. Download the free Xfinity app, or scan the QR code with your smartphone.
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