haven't had any issues so far! but I ported my existing number and haven't tried creating any new accounts which is where I suspect most of the issues arise. most carriers give out your name and address to banks so I think jmp is targeted when you are a new customer and they want to verify you through your carrier. i have switched to a local credit union for my cards so if an issue arises I can always talk to a real human to verify my identity
Also KeePassDX can do 2fa and if you keep passwords there it makes logging in with 2fa super quick and seamless