I have a time series dataset of the # of cell phone connections sorted by 2G, 3G & 4G technology platforms. In addition, I have data on cell phone storage bandwidths, processor speeds and camera megapixel bands over the same time period. I want to determine which cell phone feature (ie. storage b/w, processor speed and/or megapixel b/w) can predict the growth or decline in cell phone connections for all technology platforms. Not certain which statistical models works best? Any help or advice is appreciated.