Having a case for iPhone 4S is a good idea. The one time I went out without one happened to be the time I dropped it and the back shattered! I also travel in London a lot and so a case that also includes a London Underground Tube Map was something worth looking at.
Back in May we reviewed the Samsung Galaxy Note. In order to provide some protection it was time to get a case, so we jumped at the chance to review the BlackFrost case from Cygnett.