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Where's the postbox? can you lose weight on 50 mg of topamax Nohl said that certain management protocols built into the SIM cards are designed to give service providers access to the devices after they’ve been sold to customers by allowing the cards to communicate with one another and with servers belonging to the service providers. The communication between the SIM cards and the service providers are basically text messages that aren’t displayed on the phone but forwarded directly to the SIM card. Nearly every phone in the world, Nohl said, contains a SIM card with the capacity to send and receive these sorts of text messages without the user’s knowledge. In three years, Security Research Labs found just one phone that ignores over-the-air (OTA) communications entirely.