I do, but not for my comic. I use medibang in it. My phone is a cheap android.
Taking in consideration we are not allowed to use them or do any other personal stuff at my job, I can only use it in secret but for make some quick sketches and not forget ideas or take pics or small sketches I smug under the keyboard and do a fast color on them with my fingers or do a quick edition. Thats all.
Tbh my irl job is really busy and even if I had permission to use my devices there I have no time for that and I really need to concentrate on it.
like this old fanart I sketched analog and "colored" it
yeah I have a lot of repeated photos I forget to delete xD;;;
I prefer to wait till get home and have fun with drawing and not getting stressed about it or messing my job.
Summary
Since Im drawing for free and I hav to make a living my priority is my job so I cant take much time drawing or getting worried about drawing at the office because I cant concentrate on the story anyways. I am interrupted a lot and would get angry/frustrated for not being able to draw in peace, Id rather be patient too and wait to get home . Its healthier this way and I can separate my frustrating work from my hobby