[...] but from what I'm seeing, it seem like it could be best carried out using PC and not mobile. I'm just being skeptical about this but if it's something I can complete using my mobile, then I'm going all in.
I'm sorry for asking this sort of question but please do realise that I'm just getting fit into the system.
Thanks
You can use either mycelium and blockchain.com wallet app, they can both signed a message which is the task ask in the OP, though you can only use blockchain.com only works for imported private keys.