How to use old GSM protocols/encodings to know if a user is Online on the GSM Network AKA PingSMS 2.0
evilsocket.net/2015/07/27/how-to-use-old-gsm-protocolsencodings-know-if-a...
In the last few months I’ve been playing with Android’s low level GSM API, a few years ago the (in)famous sendRawPdu API was available, allowing a developer to manually encode a SMS message at a very low...
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