Iphone 5 signal dropping issue

Hi guys,
I just got my Iphone5 as a gift from my friend month ago.
It was really exciting when I first got it. However I found sometimes when I unlock the screen, the signal will suddenly drop to 1 bar and then searching, this will take seconds and then appears no service. If lucky, the signal will come back soon. But it still really annoying! And this happens more often recently.
I tried reset network setting few times but it didn't help at all. So I thought maybe is due to carrier's issue. I am with Vodafone, so I bought a Telstra prepaid sim and try to see if this fixed the problem. But still, keep lossing signals!
This is so frustrating!
And my battery is draining really fast as well, even I turned off wifi, bluetooth; minimum brightness; all background apps off. its still draining!!
Anybody got the same issue here? I tried google this but seems nobody got the similar problem
Could anyone help me please?!
Thanks!

Thank you for your answer!
Did your phone just fixed itself?! How long did it takes?
I'm worried if it's actually no signal after we lock the screen? I mean once I left my phone in the bathroom and I forgot so I called up but it just directly into voicemail! I thought I lost my phone!!
And what if I need to make a emergency call??

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HT1976 Iphone 4s signal dropping to no service

My iphone 4s giving me no service
I have to restart phone every 5 min
When I restart i get full signal and after few second It start dropping and stop on 2 bar and after few more seconds it give no service.
What cloud be the issue ?
Its hardware (if its hardware what component I need to change or repair.
If its software then what is the solution.
I am in Pakistan and here we have no apple store or genius bar facilities.
Help me to solve the issue otherwise iphone is non useable at the moment.
I need quick reply from Apple team.

If you have tried a restore as new expecially in DFU mode you have done all the software troubleshooting neccesary this narrows it down into a hardware issue.
Apple does not recommend doing any repairs on your own because it will void your warranty however
You would be looking into repairing your Signal Antenna
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Let me know how it goes

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Hi nezzitou,
Welcome to the Apple Support Communities!
I know you are not experiencing a “No Service” or “Searching” message as described in the following article, but I would still suggest these troubleshooting steps if you are having service issues.
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
I know you stated that you first noticed this after a storm as well. It could be that a tower your carrier uses to provide cellular service to your area may be down as well. If you go through the troubleshooting and the issue continues, you may want to contact your carrier as described at the very bottom of the article.
If you're still experiencing No Service issues, contact your carrier to check for any network or account issues that could cause these symptoms.
I hope this helps,
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Best advice is to take it to an Apple store: But is there one in Kuwait?
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Do iphone 5 s have any issues with overheating or signal drop out

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My iPhone 4 signal issues are gone...

Well, like many of people here I had the obnoxious signal loosing issue that is affecting a staggering amount of iPhone 4 users. However, I never realized I inadvertedly fixed the issue until just 10 minutes ago. I had signal issues since Day 1.
Bear with me thru this small story. I saw here a thread on MacRumors about a user experiencing camera issues on his iPhone 4. Said issue was that the camera showed a green spot in the center. I was sorta curious but never really paid much attention to it. This was 4 days ago. Flash forward to yesterday.
I was on the Apple Store picking out a new case for my iPhone 4, along with the respective screen protector. While I was doing that I saw an empty iPhone 4 demo unit and I decided to test drive FaceTime. I fired up both my iPhone 4 and the demo unit and connected. Disaster struck, my iPhone suffered from the same green spot effect as the iPhone from the user on MacRumors. Knowing full well, it was a hardware problem I set up an appointment for today at 6:30 PM.
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I am theorizing that moving the SIM card had something to do with the signal issue, because the only thing I have done to my iPhone 4 differently is take out and reinsert the SIM card. Other than that no other changes to it. No setting change, no software change no nothing. Just reinsertion of the SIM card. Now, to prove my theory, I need people who can test this and see if this fixes their iPhone. I know it did on mine, but on yours?
Check it out.
PS - No, I did not have the green blob issue fixed.
My original thread is found here:
http://forums.macrumors.com/showthread.php?t=955742
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IPhone 6 freezing after WiFi signal drops

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HT204409 Have brand new iphone 4s. Wifi signal is very weak even when very close to router. I have also an iPod Touch and when both are side by side, the iPod wifi signal is excellent and the iPhone wifi signal is very poor??!!! Hardware issue? or softwar

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Saw may web sites discussing this same issue; many discussions point to hardware problems but there is no official word from Apple about it, which is disapointing !?? Few discussions point to software problem with solutions based on try and error, and they don't seem to work.

did not help at all; the problem continues the same

Non-Scientific Evidence for Signal Loss Issue

I just did a test with my phone. I started a speed test to assure some steady data flow, and then put the phone next to a PC speaker to create the interference noise through the speakers. It came through loud and clear.
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http://en.wikipedia.org/wiki/DBm
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Signal dropping, no internet at times

Any idea how to correct weak signal or dropping calls? I have a new simm card and it seems to not help much. When searching for a new signal it takes forever.
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This is not a network issue I am having a dropped signal issue. For me and svereal opthers its not just data device will go straight to 0 bars no service and seconds later reconnect. Issue occurs every were all known good coverage areas previously even when in same building with a vzw repeater and surrounded by other verizon users droids and BBs and droids my and other iphones are the only ones with this issue and the iphones do not drop signal at the same time. reset network settings under settings > general> reset > reset network settings no affect to relibility issue is intermitant but reproducable.

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Each time the Internet goes out the router acts fat and happy. I have full green on WAN Coax, and strangely enough, a flashing green Internet activity indicator. Logging into the router shows that I am MOCA connected and assigned a WAN IP address. But I can't get out past the router at all. On the event that led to me getting a replacement router the lady said she could talk to the ONT just fine, but not the router. We reset the router and ONT port numerous times and the connection finally came back up.
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I should also add the other wonderful features I have seen. When I tried to powercycle the *new* router yesterday it decided to dump its entire config including my port forwarding. Nice... And I have given up using wireless because if I set the router for WPA it locks up so hard that it takes a master reset to get going again.
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