Hi, I am curious about how the Spark core phone app detect cores and send the wifi credentials to the core. How can I make my own phone app that can update my core’s wifi credential? I am a student and don’t have any knowledge about it, please can anyone explain to me? THANKS!!!
It’s based on Smart Config, a proprietary protocol made by Ti.
More information can be found here: https://community.spark.io/t/smart-config-the-missing-manual-now-available/442 
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And just a heads up that the Photon will use non-proprietary soft-AP setup, so it’s possible to write your own mobile code if you want to do that.