We frequently advise the use of two-factor authentication to protect accounts. Two-factor is certainly better than a single unchanging password, but there’s one major limitation: if you’re being sent an SMS with a one-time password but you want to access that service on the same phone, your protection level has essentially evaporated. According to AusCERT, that’s already a big enough issue to make two-factor systems based on sending text messages all but useless.
Chrome: Although Gmail can already send and receive text messages, it doesn’t sync with your Android smartphone. Gtext, an extension from previously mentioned MightyText, sends and receives texts directly in Gmail using your mobile phone number.
Android: We’ve seen SMS schedulers before, but Schemes takes things three steps further by allowing you to send scheduled tweets, Facebook posts and emails (via Gmail) as well.
iOS (jailbroken): The ability to send read receipts in iMessages is great if you’re talking with someone you actually like, but it’s also a disaster if you’re trying to avoid someone. SelectiveReading is a jailbreak tweak that allows you to control who sees those receipts.