OP was not originally asking for killing people with explosions ;-)
Can you make comlinks burn out , or malfunction with sprite Gremlins or something something Else ?
First Gremlin power, you can't really choose the disaster going to happen. It's up to the GM.
But 'malfunction' on a regular success and 'burn out' on 4 success or more is well within the parameters of the power I'd say.
The gamemaster chooses a malfunction appropriate to the device and situation, like a jammed control, a looped signal, or a faulty reading. If the sprite scores 4 or more net hits, treat it as a critical glitch— the device crashes, burns out, jolts its user with an electrical shock, or some other goodie picked by the gamemaster.
Secondly, hackers (including technomancers)
They can Data Spike the commlink which will cause small sparks and puffs of smoke and eventually brick the entire phone.
With access they can snoop on all communications (Snoop).
With a lot of access they can even format it (Format Device). Next time its restarted (or if they also forcefully reboot it for you with Reboot Device) it will not come back online.
If you play with rules from Kill Code you also have access to the Masqurade matrix action which let the hacker assume the identity of the owner of the commlink, and for a brief period for example intercept calls made to the commlink.