i've had t-mobile before and even tried mint too, but t-mobile is awful in (my area of) LA. so during the pandemic, i switched to visible ($30/mo) and it's been great. no congestion slowdowns yet. it has unlimited talk/text/data, and crucially, unlimited hotspot (for 1 device at a time) when i'm out and need internet for a laptop or tablet. the only potential trip-up is that customer service is chat-/email-only (no phone).

visible just recently added a higher-priced tier for 5G, but don't fall for it. the 4G tier is more than fast enough.