When it comes to buying smartphones and other mobile devices, you don’t actually get as much memory as is advertised because of the pre-loaded apps, skins and other data. iPhone does have the best percentage of giving you the most storage space though. In a 16GB 5C, you can expect 12.6GB of memory, which is 79% of the total 16 GB. The 5S has 12.28GB free, which is 77%. If you need more space than that, you will want to choose an iPhone that comes with 32 or 64 GB.