Works great for me... I have been using it for the past ~ 3 months with a pay as you go plan. Cost has been about ~ $7 per month. Before that I was using mintsim which is $15 for unlimited voice, text and 2GB of data. Both great deals but I did not need it, so I switched to Tello.
They just started a referral program, if you decide to sign up, use my link and we both get $10 credit :)
Best
Hawkeye