• Is there a reset pin on your SIM900? Without it, gprs.reset() may not be as good at resetting (if SIM900 was in the middle of receiving block of data when Espruino reset).

    But I don't think that is your problem... I don't think it's really SIM900 related at all - it looks to me like your code is passing non-executable code into a function that expects a callback. If you could post your code up here, we could take a look for you?

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