No sim card problem on iphone 4s?

I activated my phone through the internet when i got it, so it doesn't have a sim card on it, and its been working just fine for two months. I just dropped it at my house a little while ago, and it says there's no sim card, and i've turned it off and on several times. Is there a way to fix it without taking it to an att store or something of the sort?

What is a better phone: the droid razor or the iphone 4?

Here's what i need:
-good memory
-at least a little durable
-good camera with video capability
-can hold at least most of my itunes music
-has facebook, twitter, safari, youtube and gmail apps available
-can fit in a pocket
-has speaker
-good battery life

The iphone 5 isn't an option but the 4s is a possibility, i had either the droid razor or the iphone 4 in mind, but if there are any other phones that would fit my needs, feel free to recommend them

I just broke the back of my iPhone 4S?

I was helping my 2 year old out of the car, and my iPhone slipped out of my hoodie pocket and the back broke. Everything else seems to be okay, except some stuffing on the bottom, but everything works. The only problem is, pieces of glass are falling out. How much would it cost to get the back replaced, or should just replace it myself? And no I don't want a case.

How much does it cost to upgrade to an iPhone 4S with Rogers? Early upgrade?

I have only had my Blackberry since August 2011. I don't know when I'm allowed to upgrade. I'm on a three year contract.

I was wondering if anybody knew how much it would cost to upgrade my phone early? Any help would be greatly appreciated! Thank you.

Added (1). Also, I want to stay on the same plan if that is possible.

What does the grey dotted circle next to a song in iTunes mean?

I put some new music in my iTunes library and for some reason it won't sync onto my iPhone. When I click the "On This iPhone" tab and go to my Recently Added all the songs are there but they're grayed out and have this dotted circle to the left of the name. For whatever reason they just won't sync to my phone no matter what. I've restarted my phone, computer and iTunes but nothing works. I appreciate any help!

Unity3d on an older mac performance?

I'm looking into buying a used mac book/mac book pro for unity3d mac & iphone 3d games development for fun. I can't afford a new mac but I see some nice low price 2006/2007 mac books and mac book pros on ebay but as I'm completely new to mac I don't know if they will do.

Question 1: Would a 2ghz core2duo 2006 mac book (not the pro) be capable of running unity3d smoothly?
Question 2: Would there be much of a performance increase with a 2006 2ghz core2duo mac book pro instead?
Question 3: Which is more reliable, I've been reading about gfx card issues on the pro?

Why does my iphone not ring only vibrate? - 1

The mute button is not on, all the options are fine… I really don't know what it is. Also i reset it and everything. Maybe the mute button is jammed but then again i can hear other stuff like when you go in options to pick your ringtone.

IPhone email sending failure?

When I use my lap top I have no problem emailing this user but when I try on my iPhone it always returns the email back to me with this attached message:
Delivery to the following recipient failed permanently:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Requested action not taken: mailbox unavailable (state 13).

What can I do to fix this? The recipient says they don't have me blocked or anything.