The Free plan is for one phone and its data is not synced. From Pro Lite, evidence from several phones collects in one account. How many devices each plan allows is on the pricing page.

Adding a phone

Sign in to the same account on the second phone. That phone registers itself as a device.
On Pro Team you can also invite team members so each person signs in with their own account.

If you hit the device limit

Limit perangkat tercapai appears. Pick Kelola perangkat to sign out a phone you no longer use, or Upgrade plan.

Signing in to the console in a browser does not count as a device.

Data between phones

Each phone sends its evidence to the cloud and pulls in changes from the others. How it works is in Syncing evidence to the console.