The disadvantages of having a SmartphoneMay be out of money. If you bought it with little leverage, because some people will probably buy one as stream.May lose concentration at work/school? If applied just entertainment.
The downside of having a smart phone may be a waste of money if you buy it rarely use it because some people may be purchased by the current may be distracting to work / study. If used just entertainment.
The disadvantage of the smartphone may lose money if the purchase is not used to it, because some people may be naive by the current may be distracting. Working / studying if used just entertainment.