Memphis shoppers comparing AT&T Fiber and Xfinity get an unusually clean matchup: the two sell the same three download speeds, step for step, so the comparison isn't muddied by mismatched plans. What differs is everything around the speed. Xfinity's introductory price is lower at every one of those shared tiers, but it's a promotional rate, and each plan carries a monthly usage allowance. AT&T Fiber charges more at signup, keeps that price flat, sets no data cap, and uploads as fast as it downloads. Reach is the other big difference. In FCC filings for Shelby County, Xfinity reports cable service at nearly every serviceable location, while AT&T reports fiber at about half. So for roughly half of Shelby County locations this is a genuine choice, and for most of the rest Xfinity is the wired option by default. T-Mobile and Verizon also report 5G home internet across much of the county, a wireless alternative this comparison doesn't cover in depth. This comparison covers the tier-by-tier trade-off, the data allowance, and how to decide when both lines reach your home.
The short version
When both networks reach a Memphis address, the choice comes down to how long you'll keep the service and how you use it. Xfinity is cheaper at signup at every matching speed, which makes it the better short-term deal and a sensible pick for a light-use household comfortable renegotiating later. AT&T Fiber costs more up front but has no promotional step-up, never meters data, and matches upload to download, which favors households that work from home, upload a lot, or simply don't want to track promotions and allowances. Because Xfinity's regular rate isn't in the plan data we track, the long-run cost gap can't be pinned down from advertised prices alone. Where AT&T's fiber hasn't been built, Xfinity is the natural wired pick and gives up little beyond upload speed and an uncapped plan.
Cheapest intro: Xfinity · Fastest download: AT&T Fiber
Plans side by side
| Provider | Plan | Down / Up | Intro price | After promo | Contract | Data cap |
|---|---|---|---|---|---|---|
| AT&T Fiber | Fiber 300 | 300 / 300 Mbps | $55/mo | $55/mo | None | Unlimited |
| AT&T Fiber | Fiber 500 | 500 / 500 Mbps | $65/mo | $65/mo | None | Unlimited |
| AT&T Fiber | Fiber 1 Gig | 1000 / 1000 Mbps | $80/mo | $80/mo | None | Unlimited |
| Xfinity | Connect 300 | 300 / — Mbps | $45/mo | Not published | None | 1.2 TB |
| Xfinity | Fast 500 | 500 / — Mbps | $55/mo | Not published | None | 1.2 TB |
| Xfinity | Gigabit | 1000 / — Mbps | $75/mo | Not published | None | 1.2 TB |
Prices as encoded on our provider pages, last reviewed 2026-09-25. "Not published" means the provider does not publish a standard post-promo rate — expect the promotional price to rise. Coverage shown is modeled; verify the providers available at your exact address before ordering.
Which should you choose?
Choose AT&T Fiber if…
- No promotional step-up: the regular price matches the signup price, so there's no introductory period to track.
- No data cap on any plan, so heavy streaming or big downloads never count against an allowance.
- Upload speed equals download speed on every tier, a real advantage for video calls and cloud backups.
Choose Xfinity if…
- Its introductory price is lower than AT&T's at each of the three speeds both providers sell.
- FCC filings show it reaching nearly all of Shelby County, including the many addresses AT&T's fiber hasn't reached.
- Some plans include a multi-year price guarantee, which removes much of the promotional-price uncertainty on those plans.
Tier by tier: what each speed costs
Line up the plan table above and the pattern is consistent. AT&T Fiber and Xfinity each sell an entry tier, a mid tier, and a gigabit tier at the same three download speeds. At every one of them, Xfinity's advertised price is lower than AT&T's. That's the headline Xfinity sells on, and it's accurate for the promotional period.
The fine print is what the two prices mean. AT&T's is flat: its plans list the same regular price as the signup price, so the bill doesn't step up after a year. Xfinity's advertised prices are promotional and vary by market and term, and the regular rate isn't published in the plan data we track, so the table shows that column as not published. A household that expects to keep the same plan for several years should weigh AT&T's predictability against Xfinity's lower opening bill; one that shops around each year may come out ahead with Xfinity.
Data allowance and uploads
Two practical differences don't show up in the speed column. First, every Xfinity plan comes with a monthly usage allowance, while every AT&T Fiber plan is unlimited. Many households stay under a large allowance, but homes with several people streaming in high resolution, frequent game downloads, or regular large backups can approach it, and that's a limit no AT&T plan has.
Second, the upload direction. AT&T Fiber's tiers are symmetrical, so its gigabit plan sends as fast as it receives, while Xfinity's uploads are much slower than its downloads, which is how cable networks are generally built. The gap is easy to miss on a chart that lists download only and easy to feel on a video call, a large file sent to a coworker, or an overnight photo backup. Households that do those things often will notice the difference; households that mainly watch and browse may not.
Frequently asked questions
- Is AT&T Fiber available at my Memphis address?
- Possibly. FCC filings for Shelby County show AT&T fiber at about half of serviceable locations, compared with nearly all for Xfinity's cable network. Because those figures are county-wide, the only reliable check is entering your exact address on AT&T's site.
- How does Xfinity's data allowance compare with AT&T Fiber in Memphis?
- Every Xfinity plan we track comes with a monthly usage allowance; no AT&T Fiber plan has one. For a household that streams, games, and backs up heavily, that difference can outweigh Xfinity's lower opening price.
- Why is Xfinity cheaper than AT&T Fiber for the same speed?
- Xfinity's advertised prices are promotional rates that apply for an introductory period and vary by market and term. AT&T Fiber's prices are flat from the start. The lower Xfinity figure is real at signup, but it isn't a like-for-like comparison with a price that has no promotional step-up.
Bottom line
Both the numbers above and the trade-offs are only as useful as what's actually available at your address — start there, then pick the column that fits.
Dig deeper
All providers in Memphis · AT&T Fiber in Memphis · Xfinity in Memphis · Check your address