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2 results for “offline”.

• Sending SMS From the Browser — Why an Internet-Free Channel Still Matters
  Every messaging app needs the internet. SMS does not — it rides the cellular voice network that reaches places data does not. Here is the case for a text channel that works when your data connection does not, and how Tukuk bridges the two.
• How T Chat Works on 2G — Engineering a Messenger for Weak Networks
  Most chat apps assume fast, always-on internet. T Chat assumes the opposite: a flickering 2G connection, a dying battery, and data you have to pay for per megabyte. Here is how it stays usable when the network is not.