Don't buy a GSM module, use your old phone!

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GSM modules can be expensive, but using an old phone is free, you can see where I'm going with this, plus its technically recycling.

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Links and full instructions: (https://goo.gl/kGcXtm)
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• #science_technology
• #arduino_uno
• #arduino_gsm
• #gsm_module
• #cheap_gsm_module
• #cheap_gsm
• #phone_as_gsm
• #arduino_and_phone
• #arduino_phone_gsm
• #phone_gsm
• #phone_gsm_module