You can further minimize your cell phone backup costs with PTel.com, a T-Mobile MVNO, which costs $5&#x2F;month (minimum spend) and $.05&#x2F;minute.  I had them for my (lightly used) cell service until recently, when I switched to Google&#x27;s Project Fi, which opportunistically connects to either T-Mobile or Sprint, as needed.  From a reliability standpoint, Project Fi might offer a bit more piece of mind with dual providers available, though it requires late model Nexus phones at the moment.