Last night I went to bed with 144mb of internet data on my phone. I done my usual check of Twitter, Facebook, browsed for a while and went on snapchat but that's just the usual like I didn't go overboard. This morning I woke up with only 3mb of data. How did this happen I don't understand. I have a samsung galaxy s3 mini by the way and I'm fairly new to it after being an iPhone user.
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Can someone explain this please?