Istanbul cloudflare errors 525 but frankfurt doesn't

While using my mobile data it connects to cf istanbul and it gives me an error

While using my wifi connection it connects to cf frankfurt and site works

Interesting.
Maybe it could be some packet issue but … from Cloudflare Status page, I do not see any issue.

May I ask did you used Cloudflare WARP / 1.1.1.1 in between or not?
Could it be due some Web browser cache on your devices? Have you tried clearing it?

Pastebin - is that your domain which you manage and control, or you received this error while visiting it?

Due to the 525 error, kindly, may I ask have you checked within the steps from below articles regarding this error showing up for your Website?:

It should have to be something with SSL certificate at your host/origin and Cloudflare SSL options.

May I ask, before moving to Cloudflare, have you had an SSL certificate at your host/origin server for your Website and was your Website working over HTTPS connection?

May I also ask what SSL option have you got selected under the SSL/TLS tab of Cloudflare dashboard for your domain? (Flexible, Full, Full (Strict) ...)

Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:

If any other issues appear, follow the needed steps for troubleshooting from article below:

Regarding available SSL options at Cloudflare dashboard, check here:

In case you do not have an SSL certificate, you can use Cloudflare SSL, if so, kindly make sure you follow the instructions as follows on the below article to setup an SSL certificate using Cloudflare CA Origin Certificate:

Last but not least, kindly have a look here for more information regarding correct SSL settings:

Furthermore, another thing which could be, but, again, I am not 100% sure, re-check if your application or Website is working over the supported and compatible port with Cloudflare :orange: proxy mode being enabled for your domain. The list of the compatible and supported ports when using :orange: cloud (proxy mode) on Cloudflare can be found here:

Furthermore, kindly just in case, re-check if Cloudflare is allowed to connect to your origin host to as follows in the below article:

Cloudflare IP addresses list can be found here:

I’m a visitor of this site. Actually this site is banned in turkey I really don’t know if it matters. It could be the case that isp of cloudflare blocks this site. Turning on warp didn’t change anything.
I can access other cloudflare enabled sites just fine completed captha and successful redirect to the site

Also on the cloudflare status page you send, it mentions

Istanbul, Turkey - (IST) Re-routed

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