I was a long-time T-Mobile customer up until recently, but their service out here (DEN) I found extremely lacking (their recent merger with Sprint will hopefully improve things). I recently switched to Visible Wireless, which is a *wholly-owned* subsidiary of Verizon (i.e. not some fly-by-night MVNO). The main benefit of Visible is the *incredible* deal you get with membership. I am paying $25 a month for unlimited everything, including mobile hotspot data. This price is normally $40 which in and of itself is a great deal. I pay $25 with their "party pay" discount, which is similar to a family plan and has a maximum of 4 lines per party. The network coverage has been stunning, and is the same as Verizon's coverage as they use the same towers. Think of Visible like Cricket, which is AT&T's MVNO equivalent.

A couple caveats...
The data is in fact unlimited. But it is de-prioritized. What this means practically is that during times of network congestion, your speeds will drop. On any given day, my data speeds range from 1mbps to 200 mbps. Reliability has been outstanding however. I'm using a carrier-unlocked iPhone 11 Pro. They support most modern devices, but there are some exceptions for Android devices. They sell (and offer 0% financing) on a number of modern devices, and every phone they sell comes unlocked. I am always looking for a great deal and my switch to Visible has been nothing but positive. Highly recommend them for anyone looking for a better deal on wireless service, which has been getting more and more expensive recently. Their website is visible.com. If anyone needs help switching or related advice I'm always happy to provide input.