Vercel Previews and Edge Geolocation From a US Mobile IP

Vercel makes it easy to serve a different page to a visitor in Texas than to one in Tokyo, and hard to check that you did it right. Edge middleware reads the visitor's country, region and city from request headers, rewrites or redirects accordingly, and the only way to be sure is to arrive from a real address in the place you are targeting. HourlyProxies rents you a US carrier line for two hours, from $2, so you can load the preview as a phone user in Houston or Miami, confirm the headers and move on.

Geolocation headers you can verify

Vercel populates country, region and city headers from the request's source address. Your middleware might use them for currency, language, a legal notice, a store selector or a feature rollout. Load the deployment through a line in the city you want to test, log the headers from an API route, and check that the branch you expected is the one that ran. If the carrier's address database places the modem a little differently from the city label, you learn that too, which is useful knowledge about how real users get classified.

Because the line sits in one of eight US cities and can be moved free, you can walk the same preview through New York, Chicago, Phoenix and Los Angeles inside one session.

Preview deployments and protection

Preview deployments can be protected by password, by Vercel authentication or by trusted address ranges. Loading one through a mobile line is the quickest way to prove that protection holds for an outsider and that the bypass you set for your own team does not leak. Open the preview URL from the line, hit the wall, then log in with your own account and confirm the page renders.

The same visit shows you the deployment on a real consumer network: image optimization at the sizes a phone requests, the time to first byte from the edge region nearest the modem, and whether a client-side redirect loops when cookies are blocked.

Image optimization deserves its own look. The viewport and pixel ratio the test browser reports decide which variant Vercel serves, and the carrier link decides how long it takes to arrive. Open the network panel with the proxy active, check that the smallest sensible variant is chosen at phone width, and confirm that images below the fold stay lazy until they are needed.

Serverless and edge functions from a US client

Functions that call upstream services may themselves behave differently depending on the caller's region, and functions that enforce per-address rate limiting deserve a test from an address that is yours alone. Fire a few hundred paced requests from the line and watch your own limiter respond. Webhook receivers deployed on Vercel can be hit from the line to confirm signature checks and payload parsing from an unfamiliar source.

Vercel's own fair-use and abuse rules still apply; load testing a deployment you do not own is out of bounds.

A temporary log line in a function that records the forwarded address and the geolocation headers for the duration of the test is the fastest way to see what the platform actually passed through, including any intermediate proxy headers. Remove it afterwards; it has no business in production logs.

Hourly, and dedicated

One real SIM in a 4G or 5G modem we own, in a US city, carrying only your traffic. HTTP(S) and SOCKS5. Unlimited data under fair use. Rotation when you want it, sticky when you do not. 4G is $2 for the first two hours and $2 per hour after; 5G is $3 and $3; a purchase stops at four hours and never renews. Keep it all day and the paid hours count toward the $5 or $6 day price. 4G usually gives 20 to 45 Mbps and 5G 50 Mbps and up, depending on signal.

• Country, region and city headers checked from a real US address
• Preview protection tested from outside your team
• Edge and serverless behavior as a US phone sees it
• Move between our cities free, mid-session

What stays off the table

No rotating through addresses to defeat a rate limiter you do not own, no abuse of someone else's deployment, no bulk transfer through the line. Use it to look at your own work from a US phone, which is what it is for.

Setting up a Vercel proxy on HourlyProxies

1. Buy two hours in the city your middleware targets.
2. Configure a browser profile and curl with the line's endpoint.
3. Load the deployment and dump the geolocation headers from an API route.
4. Move the line to another city and repeat if your logic branches by region.
5. Let the hours expire once the headers and redirects check out.

Vercel proxy questions