Connection issue IOS

Hello, I recently subscribed to the unlimited plan.

First, my country blocks most VPNs and all Proton domains. Before subscribing, I wanted to ensure that Proton would connect over my network. So, I used my Mac with a free account and connected normally. Then, I subscribed to the unlimited plan.

Next, I downloaded the app on my iOS and connected to the VPN server. It connected quickly to the VPN server, but it was only connected to the VPN server and not to the internet. I couldn’t access any sites or apps. There was no network connection. I tried all the connection protocols and turned off Net Shield, but there was no success.

I thought the connection was blocked by my ISP, but my Mac was working fine with the VPN. Any suggestions?

Also, I have a free VPN from a store named Turbo VPN. I was using it, and it’s working normally. In case someone will say it’s a phone issue

Update:
I used secure core to connect and it worked but speed is too slow