This app was mentioned in 11 comments, with an average of 1.45 upvotes
This is the android app I used last time. It worked well, but it hasn't been updated yet for the new major:
https://play.google.com/store/apps/details?id=no.hermanj.pickemfantasy&hl=en
There's also this website that I have no experience with, but it looks like it's being actively updated for the new major:
First android app I found for this https://play.google.com/store/apps/details?id=no.hermanj.pickemfantasy&hl=en
Check on google for a website or an app for ios if needed.
It is available. Have a google check for a site or a phone app.
Edit: Fast google search - https://play.google.com/store/apps/details?id=no.hermanj.pickemfantasy&hl=en
https://play.google.com/store/apps/details?id=no.hermanj.pickemfantasy
that should do it
There are several possibilities I can think of right now
Number one would be TeamViewer (install the program on your pc and the app on your phone). So you can control your computer from your phone. But it can be very buggy and you computer would have to be on for the whole major.
You could also use this app. I used it for the last major allthough I'm not sure if it'll get updated for this major.
The last method I would recommend you the most would be to use this site. Just sign in with steam, enter your pickem code which you can get here, click on the update button in the top left corner and everything should work.
Hope I could help you.
https://csgopickem.net/ with access to a phone should work.
Alternatively, there is an Android app https://play.google.com/store/apps/details?id=no.hermanj.pickemfantasy