Ordering Smartphones from Chinese Webshops?

Im thinking of ordering this... its looks pretty sweet. I have read countless reviews from notable sites and they look good for value.

http://www.spemall.com/JIAYU-S3-4G-SMARTPHONE-MTK6752-64-bit-Octa-Core-5-5-Inch-FHD-13MP-Camera-3000mAh-NFC-RAM-3GB-RAM_g.html

OR

http://www.coolicool.com/jiayu-s3-2gb-rom-mtk6752-64-bit-octa-core-55-inch-ips-fhd-screen-android-44-4g-lte-smartphone-g-36464

OR

http://www.1949deal.com/jiayu-s3-mtk6595-octa-core-2-0-ghz-android-4-4-smartphone-3gb-ram-32gb-rom-5-5-inch-fhd-ips-screen-4g-lte-silver.html

The site says free shipping BUT , i dont know how our customs will behave once the package reaches pakistan. I mean , will i have to go to the airport customs department to get it? will there be any complications? any steps i should take in advance?

If ANYONE knows a thing or two about the laws of our customs regarding the import of a SINGLE smartphone from china , please pretty please tell me.

P.S i HAVENT ordered anything EVER from abroad. Your kind assistance is most appreciated in this regard.

Any device that contains IMEI# such as Smart Phone/Tablet will require you to take NOC from PTA.