We now use Red Pocket plans. It’s still the big 4 but you pick the network that works best for your location and needs and it’s (mostly) the same price regardless. We actually have different networks (Verizon + AT&T) to make sure we have coverage in most areas. It’s just one network per phone unlike Project Fi but you actually pick your network.
You also pick your annual plan depending on your needs. If you need just emergency phone, you can get a $4/month ($49/yr) plan with 500 MB LTE data, 100 talk minutes/100 text. 5GB LTE data(then unlimited throttled data) + unlimited talk/text is $16.7/month ($199/yr) and various other plans in between. Our high-schooler loves that 5GB plan (AT&T) ($16.7/month). The rest of us have the 1GB LTE data, 1000 min/unlimited text (2 Verizon + 1 AT&T) ($12.5/month). Could spring for the 5GB plan since it’s not much more but we don’t use much data.
And I like that each line is independent so there’s no issue removing or adding a line if we need. And we don’t share data so I’m not out of data because someone else on the family plan streamed hours of videos.