Because Apple doesn’t allow direct installation of modified IPAs from the web, you need to the duplicate IPA using one of these methods:

Add a character or number to the end (e.g., net.whatsapp.WhatsApp2 ). Tap and then Signature to re-sign the app. Using Sideloadly (PC/Mac) : Open Sideloadly and drag your IPA file into it. Click Advanced Options . Select Change Bundle ID and enter a new unique string. 2. Sign and Install the App

Once installed, the duplicate app behaves as a separate entity. Since sideloaded apps cannot usually access iCloud backups, you can link the duplicate as a companion device

: Some duplicate IPAs allow you to link the duplicate as a "Companion Device" to your main account, syncing chats without needing a separate SIM card.

Since duplicate IPAs are not available on the official App Store, they must be installed using alternative distribution methods: