I have a gingerbread android phone (Droid 3). But due to many reasons, I was unable/unwilling to use it with full potential. I have an Ipad too, but I literally use it only when I am doing exercising on a treadmill for web browsing.

But things have changed and I need a new smartphone now. So... after good amount of research and stuffs (wow, just when did Nokia go down? Weren't they no.1 in cellphone world?) I bought Samsung Galaxy S4 32gb Unlocked. It is coming tomorrow...

I have absolutely no idea anything about apps these days really.  In my gingerbread phone, right now I have...

Spotify

Sipdroid

KakaoTalk (it's a messaging app)

Amazon Kindle

and..... that's it I think. Rest of apps are all pre-installed. Now my questions are....

1.) What's the best weather app?

2.) People say I can change the locking screen. If so, what's the most used/best app?

3.) Even though I use spotify, I still have a huge FLAC file library and I'd like use them with a SD card. Any good music player which has a good FLAC support? If android does not handle FLAC files well, I guess I have to transcode them into mp3 when I copy files.

4.) Current I am using Sipdroid (Sip/Voip app) but this is just not very good. Any good recommendations for this?