These phone have 3.5 inch capacitive touch screen powered by dual core processor and runs on android 4.2.2 . Both phone have same hardware,both phones are dual sim support but SM3513 support 3G network.
SM3512 is available for 3225 and at the same time SM3513 priced 4499.
I think bsnl do the remarkable work by launching dual core smartphone at this price and the day is not so far when everyone can buy a smartphone in range of 2000 rs.
BSNL Champion SM3512 and SM3513 specifications
1. 3.5″ Capatitive Touch Screen display
2. Dual Core Processor Android V 4.2.2 (Jelly Bean)
3. Dual SIM (GSM+GSM)
4. Dual Camera (Front 1.3 MP + Rear 3MP)
5. 3G (Only in SM3513), 2G, Wi-Fi,Bluetooth
6. 512MB RAM, expandable memory up to 32GB with micro SD
7. 1300 mAh battery with 6 hours talk time