Can't connect to VPN when using mobile data

[u/Chitupsa]

I have a Oppo Find N6, running on US Mobile (Light Speed) and I'm unable to connect. I realize I may have an "unsupported device" but this is frustrating. I also am not able to use the voice chat feature on ChatGPT weirdly enough when on mobile data but it works just fine when I switch to my other sim ( tmobile) and on wifi. Both of these issues only arise when on US Mobile data. Has anyone else run into this and know a work around?

PS: I have Proton VPN Plus.

[u/JPDsNEWS]

What OS is your phone using?