UX Note: I see dead people…on WhatsApp.
How and why WhatsApp grew at the rate it did in the years it has been in existence is a topic of much discussion. Most people attribute it to the fact that WhatsApp got rid of the concept of a 'buddy list' and just used the person's address book in their phone to connect them to other WhatsApp users. I feel like the side-effects of this system haven't been discussed in detail. Multiple SIM Cards One topic I have seen discussed is the problem people run into when they use multiple SIM cards, such as switching cards when traveling. I recall traveling last year and was surprised when I loaded a different SIM that WhatsApp recognized the phone was operating on a new number, and asked if I wanted to switch to the new number. At the time I didn't realize the significance of the switch. When you change numbers, anyone who has your other number in their address book becomes disconnected from you (unless they also have the new number). Why is it that a single WhatsApp account can't be connected to more than one phone number/device? It seems a silly limitation. Changing the number from the WhatsApp perspective…