I bought Spice D88N on Saturday last week. I have an Airtel and a Reliance number.
The phone work fine. Dual mode work perfectly.
Pros
1. Dual Mode. Both the number are active at the same time
2. When a call comes it is written on the screen whether it is coming on GSM or CDMA number
3. You can make either CDMA/GSM your primary number. You can also keep one number active.
Cons
1. Music Player's output is not good enough
2. Dictionary is not good. Lack of words in the dictionary. When typing in caps all the characters in the sentences are in Caps and same is the case with small letters.
For example in my Nokia 6230 when you type a sentence it starts with Capital letter. When you press Full Stop the next sentence again start with Capital letter. This feature is missing in Spice D88n phone.
This phone is worth buying if you have GSM and CDMA numbers.
I bought this Phone from HotSpot for Rs. 7200, along with the phone I got free Bluetooth Headphone and and Aritel Connection.