iPhone lost Carrier after Call

April 21st, 2008

I was in the middle of a call 3 days ago when it dropped and showed “No Service” instead of the usual 3 or 4 bars of signal strength.

Since then I’ve restored the iPhone twice, and it’s still crazy. The first 24 hours it wouldn’t find a Network in any way. Yesterday I suddenly received a call, and It worked fine for the rest of the day, making and receiveing calls. At night it dropped a call and started showing “No Service” again. The difference now is that it shows network connection, and when I try to make a call it fails and then shows “No Service”, and a few seconds later it restores the network connection…

So far I’ve found these candidates for an explanation:

  • Some iPhones suddenly turn to crap, call tech support and get a new one – no option for me, I’m in Brazil using Claro/Telmex – no iPhone support from Apple in this case.
  • Just restart the Network settings and it comes back to life – not for me…
  • It’s a problem with the SIMcard/Carrier – No, I’ve already tested my SIM in other phones, no problem.
  • It’s the firmware – I’ve seen people complaining about this with every firmware version available, so I don’t think it is software. Mine is running 1.1.4, and has been for the last 3 weeks.
  • It’s a magnetic thing, the iPhone was placed next to some strong magnet and will come back to life eventually – Maybe, I do have a 2.5″ Hard Drive with a very powerfull magnet, and I carried it along with the iPhone a few times this week.
  • It’s a short-circuit between the antenna and the aluminum case caused by charging the iPhone while it sits over some other heat generating device – Also very possible, as I frequently connect the iPhone cable and place it over a external storage that can get pretty hot from time to time.

The solution for the last case is openning the iphone and placing a plastic film between the antenna and the case to avoid the short-circuit. I’ll try it latter and post the results.

Below is the video showing full network connection, then I place a call, then it drops to “No Service”

Entry Filed under: tech

5 Comments Add your own

  • 1. aluminum post support&hellip  |  April 27th, 2008 at 6:41 am

    […] signal strength. Since then I??ve restored the iPhone twice, and it??s still crazy. The first 24 hohttp://www.biloca.com/blog/?p=73Fundraiser will go on as planned despite accident The Post and Courier ???We have made a prayerful […]

  • 2. Eduardo  |  June 11th, 2008 at 2:58 pm

    Estou com este problema, mas fica com o sinal oscilando e vive perdendo a rede. Já fiz tudo o que você pode imaginar. Você conseguiu alguma coisa com o seu.

  • 3. Helio  |  August 4th, 2008 at 10:19 pm

    I’m having the same problem. Go to settings and choose your carrier. For some reason, it keeps dropping the carrier and you have to keep selecting it.

  • 4. Venkateswararao  |  March 10th, 2009 at 9:05 am

    I am also having same problam

  • 5. iphone  |  March 10th, 2009 at 11:16 am

    I am also having same problem to rectify this I contact tech people they told me problem in SIM card so please check once.

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