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Starting with 27C3 the GSM handset registration is managed as self-service. Just follow this simple two-step process:
Of course, the registration can only succeed when operating within the correct GSM network, so please make sure your network provider has been selected accordingly before dialing any number. Selecting a network named 27C3 or some binary digits is probably not the worst choice.
Please be aware, that your device may be monitored by fellow hackers for quality assurance and your own protection.