"Apparently, if you get your iPhone + iPhone-specific subscription plan from Orange in France, your iPhone often receives SMS that the iPhone never shows. These SMS appear normally if you use your SIM card with another telephone. According to the french version of The Inquirer, these SMS are here to check the SIM card is used inside an iPhone..."
For french readers: http://formats-ouverts.org/blog/2007/12/05/1420-ces-formats-qui-ne-montr...
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