What does the SIM have to do with reception?

Was telling our ATT rep about the reception issues many at work are experiencing. As part of the troubleshooting he mentioned adjusting the SIM card. The SIM is either in the phone or out. Also it installs one way. Has anyone heard about this? Someone explain this.

The SIM card is not involved with the radio electronics or reception. It is simply a special type of memory card like SD, memorystick, compactflash, etc., that holds your account info. However, while SIM cards are usually durable and long lasting they can malfunction or age, as can any memory card. If the network can't read your account info, this would obviously affect your reception.

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Lastly while at the AT&T Store and
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What does the SIM have to do with reception?

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