How to Hack Someone's Phone with Just Their Number (2020 Update)
REVEALED! This Is How Scammers Hack Into Your Social Media Accounts ⋆ Oriental Times
How do you hack someone's Grindr?
If you really want to wear your tinfoil hat: take your laptop, sit in a local Starbucks and use their Wifi, use to connect and do your thing.
If the target has not enabled two-factor authentication, then you should be able to access the account.