I purchased Samsung SCH-B339 like 5 years ago when it first launched. It’s a CDMA piece and the operating system is Qualcomm Brew. Actually, I lost one of my mobile at that time and I purchased this cellphone, just to keep contact with parents and friends, as it was very cheap. It costs just 1300 at that time(I am not really sure what it costs now).
This mobile has very less function but whatever its function is, is very qualitative. It comes with a mobile tracker function which works very fine and it is very rare in that kind of mobile phones.
Its battery backup is very great. In standby mode, it can long up to a week(Which deteriorates as times gone by).
In my opinion, it still the best mobile for those who calls very frequently and talks for long as, in comparison with smartphone battery backup during call, Samsung SCH B-339 has much more backup.