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That's more likely to slow you down if it's actually you data being slow. It will, however, potentially help if your browser is being slow

Always works like a charm for me. I’m on AT&T

Im on Verizon and usually VPN's are a limiting factor

Ahem:

Simply put, a VPN will slow your internet connection down, because your internet traffic is going through the VPN server: it's an extra step in the process.

https://nordvpn.com/blog/does-vpn-slow-down-internet/#:~:text=Simply%20put%2C%20a%20VPN%20will,usually%20imperceptible%20for%20the%20user.

That sounds more like AT&T being bad rather than VPN being good.

A VPN is just another link in the chain that could become a weak link. AT&T are likely inspecting your traffic to shape (prioritise) it as they see fit, for example if some chump is watching gigabyte after gigabyte of video that may be considered a lesser priority than say a messaging service. -- Your use of VPN would just impair AT&T's ability to accurately judge what your traffic is and classify it as "generic fluff".

That being said in the US didn't the FCC repeal net neutrality under the leadership of Ajit Pai, thus opening the doors for your ISPs to tier traffic into whatever fast and slow lanes they like? (E.g. cut deals with digital services to improve service quality, penalise those that refuse to pay more, etc.)

Yeah, OP is off. If the last mile is to the phone, that's where the slowdown is, doesn't matter what's on the far end.

I've generally found a lot of speed-related issues are actually DNS speed related issues. A better tip is to hardcode your DNS settings to something like OpenDNS.