My iPhone 4 will not pick up any signal?

My iPhone 4 does not seem to be picking up any signal. It is out of it's warranty so I can't get a replacement and it is currently on Vodafone. I'm not sure if it was the update, or the actual antenna, but I'm to scared to take the back of the phone to fix it, in case I actually break it.

IPhone billing problem with previous purchase?

I recently tried to download a free app but my iPhone keeps bringing up that my payment method has been declined and to enter another, I have purchased apps before and have downloaded fine. It now tells me to fix the problem in my purchase history but how do I do this? Iv been through it all and everything seems fine. This is so annoying because it won't even let me update any of the apps I have, anyone else had this problem? Or know how to fix it?

Free music app with unlimited downloads?

I need an app for my iphone that lets me download music with unlimited downloads, all the apps i download have a pro version and the free version only lets me download a couple.

How much is my iPhone 3GS worth? - 2

I have an 8gb iPhone 3GS, but 8gb is too small for me, so I have a 16gb now. I want to sell the 8gb, but can someone tell me how much you think it is worth? It is black, with no cracks, but a few very very light surface scratches, that are barely noticeable and can't be seen when the screen is on. It has the both, complete with original charger, headphones etc. It is locked to orange. Thank you!

Added (1). It has the box, not the both. Sorry!

Added (2). Yes, I know the phone is old. People have been offering me like £40, which I thought was too low. Just wanted to check.

Switching Carriers on a Verizon iPhone 4S?

I have an iPhone 4S, that is under Verizon. My bill has gone off the roof & they already disconnected my service on Verizon. I would like to switch to another carrier (SIM CARD), is it possible for me to switch to any other carriers such as T-mobile or Simple Mobile or H2O?

My iPhone doesn't hold a Wi-Fi connection anymore?

My iPhone 4S connected to my household Wi-Fi perfectly for about 8 months now and today it just stopped being able to connect to it. All the other devices in the house connect perfectly so it's not the actual connection, it's the phone. When I turn it off then on it connects to the Wi-Fi but after about 10 minutes it loses the connection and goes back to 3G networking which is extremely slow (thanks, Vodafone) and I need Wi-Fi for a lot of things during the day! Can anyone help please?

How to blacklist a number on iPhone?

I want to block certain numbers (both SMS and incoming calls) on my iPhone. Is there a way? If it can only be done via application then does anyone know good application for this?