If "nxsms" is a project-specific prefix, "nxsms code" could mean a sent via SMS, where nx might stand for "next" or a company/product name.
: When you sign up for an app or attempt to reset a password, the service sends a request to the SMS gateway. The gateway then routes a unique 5 or 6-digit code to your phone number. nxsms code
This is a "stuck relay." Turn your phone off for 30 seconds. If it continues, call your carrier. A rogue API request is pinging your number. If "nxsms" is a project-specific prefix, "nxsms code"
If you are tired of seeing these glitchy messages, here is a step-by-step troubleshooting guide. This is a "stuck relay
Some users report that WiFi calling corrupts sender ID headers. Try:
Verifying that a phone number belongs to the person signing up for a service. Why Did You Receive It?