Maybe for day-to-day communications, but in an emergency, the cellular network can quickly become saturated due to a barrage of connections. Additionally, the entire local internet can become degraded or disabled due to the emergency itself. It is important to prepare and train with alternate communication tools. No one tool can work in all circumstances, so having an assortment of options is valuable, as you can never know what will or will not work in an emergency, whatever that may be.
This Red Cross all-inclusive app lets you monitor more than 35 different severe weather and emergency alerts, each of varying degrees (notice, watch, warnings, etc). Monitor multiple locations. Send "I'm safe" notifications. Maps function includes established Red Cross shelters available. Available in iTunes and Google Play store, or text: "GETEMERGENCY" to 90999.
Nextdoor is the private social network for you, your neighbors and your community. Stay connected with neighbors and agencies in the community at large.
The Beartooth is similar to the goTenna, but includes voice.
The inReach stays connected using Satellites. Can pair with smartphone, or use in stand-alone mode.
The ER310 E+Ready compact radio automatically tune to NOAA emergency alerts when you are listening to FM/AM (or nothing). Powered by AAA, solar, or hand crank, and can charge your phone or other items. Include flashlight, and emergency dog whistle (for S&R). 2600 mili-amp hours gives up to 32 hours of normal use (and sizable to charge a phone!)
HH50B is small and automatic (easy) radio for NOAA (Weahter + Emergency) alerts. Automatically scans for best channel when turned on, or when signal lost, so you don't have to. 3 AAA batteries.
The items referenced above are for the purposes of public awareness of their functionality respective to an emergency, and not to be mistaken as an endorsement of a product or manufacturer. Individuals are stressed to do their own research when considering tools and products for emergency preparation.