If the names of these phones don't mean much to you, here's a brief summary for each:
Sony Xperia acro S: This is a top Android smartphone of the company, featuring a large 4.3" HD screen with Bravia Engine, 1.5GHz dual-core processor with Adreno 220 GPU, 1GB RAM and 16GB internal storage. Of course, it's running Android 4 Ice Cream Sandwich.
Sony Xperia advance: The Xperia advance is the U.S. version of the Xperia go (here's our review). It's a rugged Android 2.3 smartphone with a 3.5" HVGA display, 1GHz dual-core processor, 512MB RAM and 8GB internal storage. It is IP67 certified, which means it's water and dust resistant. Obviously, the weak spot in this whole configuration is the low screen resolution, which kind of ruins this otherwise healthy package.
Sony Xperia tipo dual: And here is the low-end offering - an entry-level Android 4 smartphone with a 3.2" HVGA display, 800MHz single-core CPU, 512MB RAM and 2.5GB internal storage. The key feature here is the tipo dual's ability to load two SIM cards, hence the "dual" in the name.
Anyone excited? Well, the acro S does look pretty good, although not exactly a revolution. The handsets are currently listed on the manufacturer's own U.S. website as coming soon, and while no pricing info is currently disclosed, we guess Sony will be offering them unlocked (full price), not subsidized through carriers.
source: Sony via UnwiredView