>Trying to post from work laptop but got a ban for posting cp on /random.
The IP address of your laptop is 'banned' wherever you use that.
>Posting from my phone. How fix?
It needs to be from a different IP
Why are you posting on the interwebs without a VPN anon?
If you come to this board, A VPN is highly advised to avoid 'bans'
That's because the people who run the site are retarded and can't get their shit together, bans are handed out for 'infringements' that are often not by the user.
Their shitty set up which means sometimes anons share ID's (Not tor) meaning others actions on same ID will get you banned.