I would think it depends on two things.
1) Does your phone utilize a lightning port?
2) Will a 12w adapter be the appropriate power supply? I don't have an iPhone, so you'd need to look at the adapter supplied with the phone.
For example, my Macbook uses a bigger, higher wattage adapter, but the cable would suffice.
Hope this information is helpful or that your question has already been answered by someone with more knowledge.