Warning on 2nd Hand 83xx in Indonesia
Please be aware that if you are in Indonesia and plan on buying a 2nd hand or refurbished Curve 83xx model, you risk at getting a clone. Most units are cloned and have a -1 (Minus One) as the Vendor ID.
Your Curve may work for one or two months but then your BIS will be deactivated.
If you plan on getting a second hand 83xx, please check the Vendor ID but Shift + Alt + H.
Also, many of these phones have only a few seconds showing Uptime so please do your self a favor and do not buy that phone unless you can get a 1 year replacement if you wound up with a clone.