Wireless Joint

So, running a Cudy LT18. AT&T sim is in slot 1, was tinkering with Magenta for Tablet sim in slot 2. Regardless of what I do, my T Mo speeds never reach above 1 mbps. Shot in the dark but has anyone else had this issue?

Maybe a long shot but are you using a UDP based VPN such as WireGuard? I don't know about Magenta but that pretty much kills Calyx which is on T-Mobile.