SMS 2-factor authentication isn't super secure because it's too easy to call a phone provider and do a SIM swap.
It seems like a dedicated smartphone app is significantly better here? It's just as convenient for the user, but harder to compromise.
miniblog.
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Moving from SMS (charged per message) to data-based chat apps shows how billing impacts usage.
It's quite common for me to split text up into several messages for clarity. I didn't do that when I first used SMS!
"The most interesting point [..] is that Whatsapp now send more messages than the entire global SMS system combined" http://t.co/HpGaTNvQce
http://t.co/7yYNruWbQA provides alerting via SMS or Android/iOS push notifications (amongst other things). Smartphones have won.