Instead , WinLock trivially restricted access to the system by displaying pornographic images .
Instead , WinLock trivially asked users to send a premium - rate SMS ( costing around US $10 ) to receive a code that could be used to unlock their machines .
Instead , WinLock trivially restricted access to the system by displaying pornographic images , and asked users to send a premium - rate SMS ( costing around US $10 ) to receive a code that could be used to unlock their machines .