Dual SIMcard adapter is now available for iPhone also. the price varies between $30 - $60.
check the following two items on USB fever
1. 3-in-1 External Battery with DUAL SIM Function for iPhone 3G / 3Gs
Features:
- One iPhone (3G / 3G s) with 2 SIM Cards
- No need to cut your SIM CARD
- STK Menu
- Portable power pack (Enough Power to hold your iPhone for days while you are travelling)
- Access to all ports of your iPhone 3G / 3Gs (Except the silence switch)
- As a protective case to your iPhone 3G / 3Gs (made with same material used in iPhone 3G)
- Perfect integration, almost no seams, no longer bulky
- To Sync with your PC / Mac even when the battery is on
- No need to take off the battery even you need to Sync your iPhone 3G / 3Gs
- To control when to have Data HotSync and when to charge
- USB Cable for charging (hidden USB Cable for your data connection and charging anytime,anywhere, and always with you)
- LED Power Indicator
2. Dual SIM Card for iPhone / iPhone 3G / iPhone 3Gs (for firmware 3.0)
Features:
- One iPhone with 2 SIM Cards (see note below)
- No need to cut your SIM CARD
- STK Menu
[Via Amit Bhavani]