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Now somebody needs to create a shim/blocker board. Some shims already exist that intercept phone<->SIM comms for carrier unlocking and ??? https://www.geveypr

• mike_d 5y ago
  There are all sorts of carrier specific messages that phones communicate. Carriers have systems that detect anomalous activity and blacklist them from towers because they assume the handset is broken and they don't want it to cause problems for other subscribers.