My recommendation is to start researching V2Ray and XRay protocols and translate Chinese made tutorials. This seems to be the only protocol (under the xtls-vision-rpx) that works in GFW countries like Iran, Russia and China. Buy for a month a cheapish VPS and rent it for a month in a close country like Armenia/Caucasus Region, set up an XRAY server and then download Streisand for iOS or the equivalent in Android.

Also the Chinese GFW is not this titanic wall, there are well known exploits that use the 443 TLS port to masquerade as popular wesbites signatures.

If you need some guidance lmk I can write a full tutorial on how XRay/V2Ray works and how to set it up, as well as a series of scripts to generate stuff :)

What makes you want to visit Iran - doesn't seem very relaxing to me and there are lots of other interesting historical sites in the rest of the middle east and Europe. Assuming you are coming from the US?

Lots of technical questions but what exactly are you worried about - some systems you want to have access to or some data you want to hide?

I've travelled near the Iran border on the eastern edge of Turkey and the countryside is beautiful! Hope you get the break you're looking for!

Do you know that Chinese GFW only applies to domestic numbers and services? If you have an out of country number and roaming it doesn't apply to you. I don't know anything about Iran though.

General advice:

+ As a guest it is rude to behave in ways you know your hosts consider impolite.

+ As a matter of personal safety, unwarranted risks are unwarranted.

Buying a cheap phone in Iran and enjoying your bucket list trip is the simplest thing that might work. Why try to fuck with a nation-state. Good luck.

bro, just get a good tour guide, bring a camera and forget about twitter for a few weeks, whats the problem with that?

locals use VPNs, sometimes they work, sometimes they dont... gov has on/off switch so you are at their mercy, but honestly do you need access to US social media when on a vacation in a desert?

Censorship may not be as severe as China but the Iranian government is very paranoid these days due to security breaches in the recent war. Some of those breaches were hilarious Tbh and reflected badly on the regime. Its best not to be caught with your pants down while using a VPN illegally. There is not telling what they are up to in their extreme paranoia.