Manner in diffrerent countries

There are some differences between people in Iraq and Thailand regarding visiting people and going to a restaurant. In Iraq, when I am invited for dinner from a friend it is not necessary to bring a present with me. This style is the same in Thailand.For example, three years ago my close friend invited me for a good dinner, but I did not bring anything with me.
On the other hand,there was some different regarding smoking in a house.In this case, in Thailand it is not allowed to smoke in a house, but in Iraq it is no problem.
In Thailand,people can talk on mobile in a restaurant and in Iraq it is also the same.But, in Thailand,it is does not bring children in a restaurant to avoid nosiy,while , in Iraq, this case is not a problem.