I readily admit that none of the options below are "optimal" compared to what we used to have with phones that accepted MicroSD cards. But such phones are becoming rarer. I want to capture here alternatives for those looking to expand their non-expandable phones. Probably the absolute best solution is to have a protective case that has a battery and MicroSD slot built into it. The Incipio Offgrid is such a case but it is only available to the S6 (at present). For the rest of us (all other brands including iphones) there are the following options: OTG (On The Go) plugs and cables. (If you search Amazon for OTG and the brand/model of your phone, you might find a specific cable) If you have come across specific products you would like to recommend, I encourage you to share those in this thread. Thanks Mods: If you don't feel this belongs here, feel free to move it.