You cannot remove the iphone batter like Fossildude suggests! Instead, try and power down the iphone using the PowerSlide on your touch screen which appears when you hold the power-off button on the top for a few seconds. If this does not help and you are a new user of Iphone, best is for you to take it to the nearest Apples store.
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There is a small tray you have to open on the right side of phone. You can get a sim card eject tool or simply use a paper clip that will fit in to the small hole. The tray is easy to find. Its half way down on the right side. look for a small hole and insert the sim card eject tool or small paperclip.
Hi thanks for asking, you need to get a paper clip and insert it into the tiny hole at the bottom of the iphone this will eject the sim card holder please click on this link there is a video which explain how to open the iphone.http://www.youtube.com/watch?v=kir19QRGzv8&feature=fvw. even though it talks about removing the sim card the steps are the same.
Reset the iPhone: It has been observed that simply resetting the iPhone can resolve signal strength issues. Reset network settings: In
some cases resetting the network settings has also helped so tap
Settings, tap General, tap Reset, tap Reset Network Settings. This will restart your iPhone and will also delete any stored Wi-Fi passwords as well as DNS settings and more. Place your SIM card again: If your iPhone’s SIM card is not placed properly, it has been observed that it can affect signal strength. So
a good idea would be to remove your iPhone's SIM card by pushing a
straightened paper clip into the small hole on the top of the device to
open the SIM tray, then check for debris inside the tray or SIM card
slot, remove it by blowing into the slot or using compressed air and
then placing the SIM card properly and then re-inserting the SIM tray. The notion is that improper SIM contact can result in a weak signal, so the above procedure could help. Attaching scotch tape to the SIM card: This
is indeed the most ingenious methods, it appears that attaching a small
piece of scotch tape to the outer side of the iPhone’s SIM card (the
side of the SIM card that does not have metal contacts) can result in a
surprising boost again borrowing from the notion that improper SIM
contact can result in a weak signal.
You can try a system reset by powering the unit off, removing the battery and SIM card for several minutes. Reinstall the SIM and battery then power up. If that doesn't work, you're in need of a replacement touch screen.
If iPhone won't turn on, or the display freezes or doesn't respond
Press and hold the Home button for at least six seconds, until the application you were using quits.
If that doesn't work, turn iPhone off and turn it on again. Press and hold the Sleep/Wake button on top of iPhone for a few seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
If that doesn't work, reset iPhone. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears
More resets: Try This: 1. Remove Sim Card 2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears 3. Replace Sim Card 4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.
Also, Try this: 1.) Shut down the iPhone 3G. 2.) Start up iTunes 3.) Hold down HOME button on the iPhone 3G 4.) While keeping the HOME button depressed, plug in the Sync cable 5.) A message will pop up to ask if you want to reset. 6.) Just click YES and the reset process should start.
Check your sim card is properly inserted You should be prompted for the sim pin number when the iphone loads up (if it has one set). If the pin number is not entered the sim card will not register with your provider.
If you open settings, what is next to "carrier" ? it should state your provider there. If it doesn't, tap it and see if it will list your carrier, by default the iphone is set to automatic, you may need to manually select your provider.
If none of this works, give a detailed description of what has been tried and any other details you can