The first one, which comes in two variants, is the Nokia C1 (the C1-01 and the C1-02).
The C1, runs the Series 40 interface, and apart from being very wallet friendly, at under EUR 40, has a standby battery time of 6 weeks!
The C2, the other Dual Sim phone, is the next model in the line. It features hot swap on the second sim, which basically means that you can swap the second sim card without switching off your phone.The C2 will cost around EUR 45.
Both the C1 and C2 have GPRS, Bluetooth, a Micro SD card slot and a 3.5mm jack. What they offer is amazing value for money. Apart from just the devices themselves, these two phones will come bundled with services such as Nokia Messaging, Ovi Mail, Ovi Life Tools, and in certain markets, Nokia Money.