All A+ grade devices carry 6 months warranty period. This grade is promised to flawless from any wear and tear and in excellent cosmetic condition. It normally does not have any marks, cracks, or scratches. Moreover, the battery life for each article is different, and is above 90 percent in most of the cases.
All B+ grade devices are in very good condition with very neglectable scratches or marks. Otherwise they are very clean. They carry 3 months warranty period. Normally they have little usage marks but flawless from any technical failures or faults.
These phones are in good overall condition and may show some scratches on front and back due to routine use. They have no technical fault and we can say that they are used with good care.