Product info
San Diego eSIM plans
| Unlimited data · 5 days | $17.99 | Buy eSIM |
| Ohayu recommendsUnlimited data · 10 days | $33.99 | Buy eSIM |
| Unlimited data · 15 days | $39.99 | Buy eSIM |
| 3GB prepaid eSIM · 14 days | $8.49$2.83 / GB | Buy eSIM |
| 5GB prepaid eSIM · 30 days | $13.49$2.70 / GB | Buy eSIM |
| 10GB prepaid eSIM · 30 days | $21.49$2.15 / GB | Buy eSIM |
| 15GB prepaid eSIM · 60 days | $27.79$1.85 / GB | Buy eSIM |
| 20GB prepaid eSIM · 90 days | $34.49$1.72 / GB | Buy eSIM |
| 50GB prepaid eSIM · 90 days | $73.49$1.47 / GB | Buy eSIM |
You can install your eSIM before the trip and activate it when you arrive in United States. Validity starts after eSIM activation.
Plan details
How much mobile data you need
What's the best eSIM for San Diego?
Long weekend – 3 GB
Maps, beaches, brewery hunting.
A week – 10 GB
Daily navigation and calls.
San Diego and LA – 20 GB
Both cities plus the drive between.
Working from North Park – Unlimited
Tethering a laptop from a café.
Coverage and network
Coverage, and the border
United States mobile networks
San Diego is straightforward: dense coverage across the city, the beaches and the North County corridor. The thing worth knowing has nothing to do with signal strength - it is that a US plan stops at the border, and San Ysidro is a 20-minute trolley ride from downtown. (Speedtest by Ookla, June 2026)
Speedtest Global Index · Mobile · United States · June 2026
Download
197.34 Mbps
Upload
10.35 Mbps
Latency
27 ms
Global rank
#10 of 98
San Diego, specifically
- Downtown, Balboa Park, La Jolla: Strong throughout, including the zoo grounds and the cliffs at Torrey Pines.
- Crossing into Tijuana: This one catches people out. A US plan does not cover Mexico. Walk across at San Ysidro and your data stops, even though you are still on the trolley line you started on. You need a Mexico plan for that side, or you are on airport-Wi-Fi-and-hope.
- Beaches and the Coaster: Coverage runs the length of the coast rail line up to Oceanside, and on the Coronado ferry.
- Anza-Borrego and the backcountry: An hour east and the desert parks lose it. Julian and the mountain roads are patchy between towns.
Fifty states, one border
The plan works across the US, so LA and Vegas are covered. Mexico is a separate country and a separate plan.
How to install eSIM
Connected in 3 steps
- 01
Buy before you fly
Choose your data plan before your trip.
- 02
Download & install
Log in to your account, tap your eSIM, and follow the on-screen instructions.
- 03
Land & activate
Activate when you arrive in United States. Turn on roaming for the eSIM and it connects to a local network.
Before you buy, make sure your phone supports eSIM — see Ohayu compatible devices list or dial *#06#. It's a free request to your phone's settings. If you see the EID number — your phone is eSIM-compatible.
Arriving in San Diego
Airport Wi-Fi at SAN
San Diego International gives two-hour free sessions, and you can start a new one when it expires.
Side by side
San Diego eSIM Comparison
Indicative comparison based on publicly listed USA plans as of August 2026. Competitor pricing and policies change - check their sites for current terms.
Frequently asked questions
Where to buy a SIM card in San Diego?
SAN has carrier kiosks, and there are AT&T, T-Mobile and Verizon stores in Fashion Valley and Westfield UTC. Retail beats airport pricing. An eSIM saves the stop.
Will a store ask for ID for a prepaid SIM?
Not for the sale itself - there is no federal requirement. Some clerks ask for a ZIP code to fill a form field; anything works. An eSIM has no counter step at all.
Will my US eSIM work in Tijuana?
No. A US plan covers the United States only, and Mexico is a separate destination with a separate plan. This matters more in San Diego than anywhere else in the country, because the crossing at San Ysidro is a short trolley ride from downtown and thousands of visitors make the trip. If you are going over for the day, either buy a Mexico plan as well or plan to be offline until you are back.
eSIM not working in San Diego?
First check you have not crossed into Mexico - that is the most common cause here. Otherwise confirm the Ohayu eSIM is your selected data line and roaming is on for it, then toggle Airplane mode. Chat and support@ohayu.com are open 24/7.
