Surely the majority of smartphone users iPhone 6s at least once, but wondered what the special marking on the back cover means. Residents of Europe or Russia will find the inscription A1688 there. 
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These phones are shipped in small batches to the US markets, where they work only with T-Mobile operators, and to Europe. A distinctive feature of such gadgets is the support of a huge number of communication networks and the Internet.
The box of such a phone contains a European charger and a paper clip. If necessary, it can be referred to repair under warranty in any Apple – service on the territory of the Russian Federation.
A pleasant bonus for the user will be the presence of absolutely all options, however, because of this, a phone labeled A1688 is priced slightly more expensive.