Use two SIM cards at a time in iPhone 3G / 3Gs

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]