IOS 7 doesn't play most of my songs?

I recently updated my iPhone 4S to IOS7 and since then my phone has stopped playing about 80% of my songs! They just appear as grey squares! I went to the apple shop and they told me to do a factory restore and then update my contacts etc from iCloud, I have done that twice and still once the songs are synced onto my iPhone it refuses to play most of them! Anyone know what else can be done in this situation?

Will the internet on my iphone work in India?

I live in the US and have a new iPhone 5c. I also have unlimited data with tmobile. I'm going to India soon and was wondering if my data on my phone will work there too. I won't call because I know that will cost a lot, I just want to use the internet

Itunes slit album on iphone?

I preordered MMLP2 and it split it into two albums and they both have different release dates. How can I put them back into one album using my iphone?

Looking for a potable charger case for my iPhone and not sure what to get?

I'm going to NYC in December and will be away from a plug from around 5 am to 9:30 pm. I know at some point my phone will die but I'm looking for a case that will charge my phone well when needed. I have a iPhone 4s and looking for something cheap because I need to buy one for my mother also. Links would be great.

IMessage not working on IPhone 5c?

I just got a brand new IPhone 5c. I tried activating IMessage and it says 'waiting for activation'. When I try to sign in it says I'm unable to and to try again. I have never had an IPhone before, but I've had several IPod Touch's so I already had an ITunes account. Do I need to make a new one for this? Or how do I fix this? Because I've tried resetting it and toggling on and off IMessage and Facetime and everything. What do I do?

How much is my iPhone worth and where can I sell it with low standers?

So I know these are TOTALLY out of date but i have this 3g phone these are the details.

* White color
*16Gs
*Like 2 light scratches
* AT@T
* Would have complete charger set
* Charge lasts multiple hours
*Camera in shape
*Fast screen touch response
*Buttons work perfectly fine

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Where can I sell this iPhone with low standers.
So basically i can get at least $10 for it.