Export sets are non local sets.
Not distributed by local authorise dealer.
So no warranty locally.
The shop MAY have shop warranty, from few days to months.
When they put as export sets, they don't include GST (if I remember correctly).
Also the export set might not be 100% same as local set. Like different variant.
May be different model with different spec.
Samsung Galaxy Note 2 sold in SG is LTE (4G) enabled, GT-N7105. Then there's non 4G model, not distributed but local Samsung GT-N7100. If you google, there's other model as well. If I'm not wrong, Korea's model is also different if you search in Qoo10. Then there's also dual SIM model.
- Thou it's less messy nowadays. Usually only US locked models, CDMA model, etc.
Other brands have similar issue.
Why so any model? Cos of price. Different country uses different band spectrum for 3G and 4G. And the chip usually do not cater to all. If it does, price also increase.
Also for China branded phone, there's their local processor MediaTak vs Global processor SnapDragon and others.
They processing speed is different and also support for bandwidth is different.