carver... firmware updates are not simple. The fact that they appear simple to the use is the experts making it appear that way. Any firmware update can go awry and what apple is saying there is that updating from modified firmware to official firmware will possibly render your device as as a "brick". This can happen with any device even a games console... once you run CFW you cannot go back to OFW.
I regularly do use mobile web... and there's nothing wrong with my phone.
Some mobile phones can be picked up on scanners.If you have a mobile phone I would not dream of contacting my bank or ordering anything off of the Internet as they will pick up all off your details.Not sure if the new digital scanners pick up different mobile calls or not.