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> modded GSM phones What do you mean by this? I'm genuinely curious. "modded GSM phones" yields zero hits on Google for me.

• baybal2 9y ago
  Stuff like TopSec S35 or Security AG. Some are garage made. All of them basically put a block cypher in between the GSM codec chip and the modem. Such stuff was relatively easy to do on old dumbphones
  • acct1771 9y ago
    Are there any modern incarnations?