If you wish to change your device / contact number at any point of time, you’d want seamless migration of your contacts and settings. BBM and WhatsApp handle account migration in totally different ways.
WhatsApp uses phone numbers for account registrations, so if you wish to change your phone number, you will lose your previous WhatsApp account entirely. If the same phone number is used on a different device, you will lose all your contacts from your previous device. Thus, WhatsApp accounts are very loosely integrated with your contacts.
BBM is device specific for BlackBerry users. In BlackBerry OS, the BB PIN is generated for the user against his / her BlackBerry device. However, BBM on iOS and Android follows a different approach. Each BBM user on iOS and Android has their own login credentials. And the BBM PIN is mapped to their account as a whole, not the device itself. So, you can login to BBM on any Android or iOS device and immediately get access to all the previous contacts. So, you may literally switch your devices any time you want to. You can, however, sign in to only one device at a time.
Due to seamless contacts and settings migration, we pick BBM yet again.
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