Can the same app account be used on several devices?¶

Yes. Activity attributed to an account may originate from any authorised phone, tablet, computer, browser or other session rather than the handset being examined.

Synchronisation spreads records¶

Messages, uploads, deletions and settings can appear across devices with different local timestamps and notification states. Some services list trusted devices or concurrent sessions; old, lost, sold or shared devices may remain listed after use ends.

Attribute the event to a session¶

Preserve login history, session IDs, device identifiers, installation IDs, network addresses, notification tokens and local databases. Compare timing to identify which device created the action rather than merely synchronised it.

Then connect that device and session to a person through possession, location and access. One account across devices does not mean the account holder personally operated each one.