Whilst you've been fumblin' with covers to load a spare micro USB card into your phone, the people at Leef Technology came up with a brilliant idea they named as the Leef Access. Simply put it's a dongle, or a smart adapter, that will use your spare card to be used from your Androids micro USB-connection.
It's got many uses as you can use it for your audio files, TV-series and almost every thing you want to do with a smartphone and a memory card. The phone takes the data directly from the card which will give you almost as much as unlimited space for those phones that seem to be crippled by a small memory.
The Leef a uses microUSB 2.0 connector. It comes with a LED indicator and, according to the Leef people, it's water and dust resistant. It can be used with phones that are running Android 4.1 Jelly Bean or later versions. At $9,99 it's available form Amazon or the Leef webshop. You can either buy yourself a new card or use your old microCard.
While they were at it, they've also developed the Leef Bridge, a dual USB/microUSB flash drive. It works as the Access but as you can imagine, it has it's own memory inside. It comes with either 16, 23 or 64Gb at respectively $19,99. $34,99 or $59,99