On/Off

Transmutation Cantrip
Casting Time: Action
Range: 60 feet
Components: VS
Duration: Instantaneous

Target. One electronic device within range, as long as the device has a clearly defined on or off function that can be easily accessed from outside the device.

Effect. You activate or deactivate the electronic device.

Special. Any device that requires a software-based shutdown sequence to activate or deactivate cannot be affected by on/off.

Cantrip Progression. This spell improves in certain ways when you reach higher levels.

5th level: The spell has a range of 150 feet.
11th level: You can ignore the verbal component of the spell.
17th level: You can also ignore the somatic component of the spell.
23rd level: The target of this spell no longer needs a clearly defined on off function to be affected.
28th level: You can target a construct creature with this cantrip. If you do, the creature must make a Constitution saving throw. On a failed save, the creature is Poisoned and Slowed until the end of its next turn. If it fails by 5 or more, it is also Stunned until the end of its next turn, and Poisoned and Slowed until the end of the turn after that.

Source: UA: Modern Magic

Changelog

Added improvements based on caster level.
Added epic level cantrip progression.