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  • Please explain better. How many nodes are sending data? You need a GSM module that can act as an access point as well? Commented Oct 4, 2016 at 1:50
  • 3
    Why not just use a cheap Android phone? Commented Oct 4, 2016 at 10:03
  • GSM modules tend to use large amounts of current when transmitting so you might find that the ESP modules reset. Why by an Arduino, stick to an ESP8226 and use that as you access point. Commented Oct 4, 2016 at 10:17
  • All the ESP (5) are connected individually with their own power supply and they all record certain analog value to be sent to GOOGLE spreadsheet using pushingbox. And my instructor already rejected the idea of using a cheap Android phone. Commented Oct 6, 2016 at 17:29