Short answer
Probably, at no extra cost. Cozumel is in Mexico, and all of Verizon’s Unlimited plans, AT&T’s eligible unlimited plans, T-Mobile’s T-Mix and Experience plans and UScellular’s Everyday and Even Better plans include talk, text and data in Mexico. Check your plan before you go. If Mexico isn’t included, Verizon’s TravelPass costs $6 a day there, while a Mexico eSIM with 1 GB for 3 days costs $4. On a cruise, the charge to watch for comes at sea, when your phone can connect to the ship’s own network.
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Is Mexico included in my plan?
| Option | Cost | What you get | Source |
|---|---|---|---|
| AT&T: Mexico included | Included in some plans | uses home plan allowance; talk, text, data; billing cycle; Included on AT&T's eligible unlimited plans. Other plans can use the International Day Pass. At sea, cruise ship networks cost $20/day. | att.com Verified Oct 6 Checked Oct 6, 2026 |
| T-Mobile included Mexico roaming | Included in some plans | 15 GB high-speed (T-Mix More, Experience More 2.0) or 30 GB (T-Mix Loaded, Experience Beyond 2.0), then 256 kbps; talk, text, data; billing cycle; T-Mix Standard includes Mexico at up to 128 kbps only. Essentials and other older plans differ. | t-mobile.com Verified Nov 7 Checked Nov 7, 2026 |
| Verizon: Mexico included | Included in some plans | uses home plan allowance; talk, text, data; billing cycle; Included on all Verizon Unlimited plans. Other plans: TravelPass at $6/day in Mexico. | verizon.com Verified Oct 6 Checked Oct 6, 2026 |
- Verizon: all Unlimited plans include Mexico. Other plans can add TravelPass at $6 a day in Mexico.
- AT&T: eligible unlimited plans include Mexico. Older and prepaid plans may not; look for “Mexico & Canada” in your plan details in the myAT&T app.
- T-Mobile: T-Mix More and Experience More 2.0 include 15 GB of high-speed data in Mexico, and T-Mix Loaded and Experience Beyond 2.0 include 30 GB, then up to 256 kbps. T-Mix Standard includes Mexico too, but only at up to 128 kbps, which is enough for messages and little else. Essentials and older plans have different terms.
- UScellular: Everyday and Even Better plans include Mexico (details below).
- Prepaid and smaller carriers vary a lot. Check your carrier’s international page or app before you travel.
If your plan includes Mexico, you don’t need an eSIM for Cozumel. Your phone connects to a Mexican network when you’re ashore, and your own number keeps working.
Will UScellular work in Cozumel?
Yes. T-Mobile bought UScellular’s wireless business in August 2025, and uscellular.com now sends you to T-Mobile’s site, but UScellular customers kept their old plans for the time being. The last version of UScellular’s travel page (January 2026) listed these terms for Mexico:
- Everyday and Even Better plans: calls, texts and data in Mexico are included.
- Other UScellular plans: a Mexico and Canada Daily Travel Pass cost $5 a day. You had to ask for it in a store or by phone, so set it up before you leave.
- On the cruise ship’s network: rates started at $3.50 a minute and $3.50 per MB, so keep data roaming off at sea (see the next section).
If your account has already moved to a T-Mobile plan, T-Mobile’s Mexico terms apply instead. Check which plan you’re on in your carrier’s app before you sail.
The charge to avoid: the ship’s network at sea
“Mexico included” only applies on Mexican networks. Out at sea, your phone can connect to the cruise ship’s own mobile network instead, which carriers bill as a separate, expensive service. AT&T’s Day Pass costs $20 a day per line on cruise ship networks, even on plans that include Mexico, and UScellular charged from $3.50 per MB.
- Before the ship sails, turn off data roaming on your phone.
- Keep it off at sea. Use the ship’s Wi-Fi if you bought a package (see Voom prices by ship for Royal Caribbean, Carnival Wi-Fi prices for Carnival, NCL Wi-Fi prices for Norwegian, MSC Wi-Fi prices for MSC and Princess Wi-Fi prices for Princess).
- Once you’re ashore in Cozumel, turn data roaming back on, or switch to your eSIM.
- Check that the network name in your status bar is a Mexican carrier, not the ship.
When a Mexico eSIM is worth it
- Mexico isn’t on your plan. A 1-day or 3-day eSIM costs less than a single day of most roaming passes.
- You want more data than your plan gives in Mexico. T-Mobile’s 15 GB on T-Mix More is plenty for a port day, but T-Mix Standard’s 128 kbps is too slow for maps or photos, and some plans slow you down sooner.
- More than one phone. A cheap eSIM per phone can beat paying extra-line fees.
- Your cruise also stops at Costa Maya or Progreso. Both are in Mexico, so the same eSIM covers them.
| Stop | Roaming if Mexico isn’t included | Mexico eSIM (cheapest verified that fits) |
|---|---|---|
| One day in Cozumel | Verizon TravelPass $6 | Airalo 1 GB / 3 days ($4) |
| Cozumel + Costa Maya | Verizon TravelPass $12 | Nomad 1 GB / 7 days ($5) |
| A week in Cozumel or the Riviera Maya | Verizon TravelPass $42 | Nomad 3 GB / 30 days ($7) |
Which network will I be on?
Mexico’s mobile networks are Telcel, AT&T Mexico and Movistar. Airalo and Nomad say their Mexico plans use AT&T Mexico and Movistar; Holafly says Movistar and Telcel. US carriers that include Mexico also connect to Mexican networks.
Buying a Mexican SIM
Telcel is Mexico’s largest network. Its prepaid “Amigo Sin Límite” packages range from about MXN 50 (500 MB for 7 days) to MXN 500 (8 GB for 30 days), with calls to the US and Canada included. You buy a SIM in a Telcel store and top up at OXXO convenience stores. We couldn’t check these prices on Telcel’s own site, so treat them as a guide. For a cruise stop, a SIM is rarely worth the time; for a long stay on the mainland it can be.
Common questions
Will my US cell phone work in Cozumel?
Yes. AT&T, Verizon, T-Mobile and UScellular all work in Mexico, and many of their plans include it at no extra cost. Your phone connects to a Mexican network once you’re ashore. The same goes for Cancún, Playa del Carmen and the rest of mainland Mexico.
Will I be charged roaming in Cozumel?
Not if your plan includes Mexico. All Verizon Unlimited plans, AT&T’s eligible unlimited plans, T-Mobile’s T-Mix and Experience plans and UScellular’s Everyday and Even Better plans do. Otherwise your carrier charges its Mexico rate, such as Verizon’s TravelPass at $6 a day.
Does my phone work on the cruise ship near Cozumel?
At sea, your phone may connect to the ship’s network, which isn’t covered by “Mexico included” and is billed at high rates. Keep data roaming off until you’re ashore.
Do I need an eSIM for Cozumel?
Only if your plan doesn’t include Mexico, you need more data than it gives, or you’re on a prepaid plan that charges for Mexico. Otherwise your own plan works.
Does the same eSIM work in Cozumel, Costa Maya and Progreso?
Yes. All three are in Mexico, so one Mexico eSIM covers them.
More: eSIM for a Caribbean cruise · Do I need an eSIM? · How to install an eSIM