The app may good. But if it is AT&T does not use it to improve performance. – AT&T Mark the Spot Review

Been here 8 years and using the app for 3 or 4. There has been zero improvement for reception. We can’t make calls or receive calls from our house frequently( cell phones). Used Speed check and the speed is an average of 5mb but dips below 2mb. They are apparently using a Sprint tower.
Review by sryan79941 on AT&T Mark the Spot.