If Iphone 5s has dual sim is it fake? Is it common for iphones to have duali sim?

If Iphone 5s has dual sim is it fake? Is it common for iphones to have duali sim? - 1

No.

The only dual-SIM iPhones are either Chinese fakes which look a bit like an iPhone (sometimes nearly identically so) but actually run on what's typically an old version of Android customised to resemble iOS or those ones which have been fitted with a bulky duel-SIM conversion case. Those conversions connect to the SIM slot and the case itself then holds switchable SIMs and typically incorporates an additional battery as well. But the extra bulk and inconvenience often means it's simpler and more reliable to just carry two phones.

There's currently no genuine dual sim iphone…

Yes it is fake. No iPhone has dual sim

Yep. FAKE. Sorry, buddy.

Definitely fake, that's a Chinese knock off

It is completely uncommon for any iPhone to have a dual SIM option. All iPhones single SIM phones.