Website Works on Wi-Fi but Not Mobile Data: Why?

Website access problems that occur on mobile data but not Wi-Fi need a comparison of the two connections. The working connection shows that at least one route to the site succeeds; it does not identify why the other route fails.

Compare website access problems on the same device

Use the same phone, browser and exact URL for both tests. Record the time, network provider and error message. Check whether other websites load and whether the problem affects one page or the whole domain. A second device or an unrelated connection can help separate a device problem from a network-specific problem.

Keep the distinction between a browser timeout, a DNS error, a certificate warning and an HTTP error page. Those observations tell the site owner or provider where to investigate. Avoid changing WordPress plugins simply because one connection cannot reach the website.

Compare the DNS answers

Ask the administrator to compare the addresses returned for the hostname on working and failing connections. Cloudflare’s DNS record reference explains that A and AAAA records map names to IPv4 and IPv6 addresses, and TTL controls how long resolvers cache a response. After a hosting change, check whether both networks reach the intended destination before editing records again.

Where IPv4 and IPv6 paths differ, the administrator should check the affected path and configuration. Deleting records or disabling a protocol without understanding the setup can create a second fault.

Investigate website access problems at the network layer

If the same URL consistently fails on one provider, give the provider the timestamps and failing destination details. Cloudflare’s network-filtering guidance describes how a site can remain reachable from one network while traffic to some addresses fails from another. An administrator may need traceroute or MTR evidence to identify where traffic stops.

A successful connection from elsewhere is a comparison point, not a reason to bypass a security warning. If the request reaches a firewall or security service and is blocked, review its event records and the specific rule before changing protections.

Retest website access problems after a targeted repair

Repeat the same URL on the original working and failing connections. Confirm that the page, images and enquiry form work, and record what changed. If the site returns a Cloudflare 522 or 524 error, use our Cloudflare timeout guide to investigate the origin connection or response.

For help, provide the affected URL, exact error, times, network names and tests already completed through website technical support. That evidence is more useful than a general report that the site is down.