Nokis 2100 was my first phone and I used it 5 long years. I am happy to share my view about this. There are following qualities I found in this phone;
Battery Long Lasting:
The battery backup is very good. It gives 7 days back up once you full charge the phone.
Very Durable:
The body of this phone is very strong. It is very durable and it never breaks if you throw it.
Easy to Carry:
It is very compact so that you can easily carry this phone in your wallet or bag.