i am trying to build a general forecast at work, but i am in trouble about the frequency of my series. Can a subject reason guide me through the frequency selection? I have daily data, so i could choose frequency=7 for weekly seasonality. But the data is about mobile traffic, and the cycles long 30 days. When i compare both frequencys (7,30), the models with 30 frequency have lower information criteria and it looks like have a better fit. Can the business nature of the data and the information criteria results give me support to select frequency=30?