My iphone 4s

http://www.payetteforward.com/my-iphone-wont-ring-heres-the-real-reason-why/

Found a good book for you
Iphone 4S Superguide by Jason Snell 2012 English PDF EPUB

Your iPhone 4S must be locked to some other specific network. That is why it is not working with your T-mobile SIM card. You need to unlock your iPhone 4S. You can unlock your iPhone 4S using remote unlocking service. You can get the remote unlocking service for an iPhone 4S from MobileUnlockSolutions.com at affordable cost with an easy unlocking guide. Good luck.

I believe the only way to make Bluetooth not discoverable is to turn Bluetooth off all together. It's designed to search for discoverable devices when turned on. I only turn on Bluetooth when using specific devices, else it's a battery hog. Google some sites for saving battery life on a 4S and you'll be surprised what is on that you may not need.

Corrupted software

It isn't often that Apple gives specific directions about how to fix your problem! Restoring the iPhone 4S will erase everything on it, so make sure everything on the iPhone 4S is stored elsewhere prior to restoring. To restore, connect your iPhone 4S to a computer with iTunes installed. Click "Restore" on the iPhone 4S summary page (click on your iPhone icon on the left menu to find this page). Follow the directions to restore. If your iPhone 4S displays the text "Please wait. Very Low Battery," leave it plugged in. This charges the iPhone 4S enough to be able to restore. If the iPhone 4S hangs on this screen for long periods of time, you may need a new battery.

Force restore mode

If your iPhone 4S is hanging with an Apple logo, or exhibiting some other software problem that prevents iTunes from recognizing it, you can force it into recovery/restore mode and then use iTunes to restore the software.
If the device is powered off, plug one end of your USB cable into the iPhone 4S and leave the other end disconnected. Press down on the Home button, and keep holding it down while you plug the USB cable into your computer. After 5-10 seconds, you should see a "Please Connect to iTunes" image on the iPhone 4S, and iTunes should prompt you to restore the software; follow the prompts and the instructions given above.
If the device is powered on, hold down both the power and home buttons until the device reboots and displays the "Connect to iTunes" image (generally, 5-15 seconds).
God bless you

isn't often that Apple gives specific directions about how to fix your problem! Restoring the iPhone 4S will erase everything on it, so make sure everything on the iPhone 4S is stored elsewhere prior to restoring. To restore, connect your iPhone 4S to a computer with iTunes installed. Click "Restore" on the iPhone 4S summary page (click on your iPhone icon on the left menu to find this page). Follow the directions to restore. If your iPhone 4S displays the text "Please wait. Very Low Battery," leave it plugged in. This charges the iPhone 4S enough to be able to restore. If the iPhone 4S hangs on this screen for long periods of time, you may need a new battery.

God bless you

Hi, You can unlock an iPhone 4S locked to Telus network using remote unlocking service. This method of unlocking is safe, simple,. affordable and quick. you can get the remote unlocking for an iPhone 4S from www.prounlocking.com/apple-iphone-4s/rs16wp9/ at affordable cost with easy instructions on unlocking. This method of unlocking also doesn't require a Jailbreak too.
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UNLOCKING STEPS FOR AN iPhone 4S
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1. Wait for us to send you an email saying your phone has been activated or remotely unlocked.
2. Install the latest version of iTunes.
3. Make sure your Apple iPhone 4S phone software is updated to the latest version using the iTunes software.
4. Connect your Apple iPhone 4S to iTunes with a NOT ACCEPTED SIM card.
5. Wait until iTunes detects your Apple iPhone 4S.
6. Disconnect your Apple iPhone 4S and reconnect it after 10 seconds.
7. Your Apple iPhone 4S is now unlocked.

The Apple iPhone 4S manual or user guide has been published by Apple at their website. This Apple iPhone 4S manual is available online and you can download it directly from apple.com. The Apple iPhone 4S user guide is written in 163-pages of PDF document format (15.39 MB). You can download this manual directly to your Apple iPhone 4S smartphone and read it by using PDF reader application. This Apple iPhone 4S user guide provides complete information and instructions about how to operate the Apple iPhone 4S mobile phone properly. Don't forget to check these supplied accessories before operating the Apple iPhone 4S smartphone: iPhone 4S, Dock Connector to USB Cable, Apple Earphones with Remote and Mic, USB Power Adapter, and Documentation.