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S3 - suddenly Mobile network not available

24th August 2012, 12:07 PM   |  #1  
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I have a Samsung S3 GT 19300.
Purchased in Hong Kong. Using China Unicom, and I have a monthly plan, fully paid up.

It is stock - I have not rooted it.

Suddenly, about 3 days ago, I started having problems with it connecting to the network. I ignored this issues because I was on vacation, and roaming ... so I thought it was due to the roaming.

I'm back home now, and I can not make any calls.

When I call out, the phone:
- sometimes doesn't connect to the network - the call doesn't go through at all
- sometimes dials the other end, but there is no sound between the two phones. When that happens, the phone connection lasts about 15 seconds, and then the Samsung phone shows the network as not available, with the circle with a slash through it, and says "Mobile
network not available".

I've rebooted many times.
I've took out the SIM card, and put it back in.
I've checked the firmware - and the firmware is current.
I've disabled JuiceDefender Ultimate

Strangely, I CAN send data thru the network, but can not receive or make calls.
I also found out that WHILE I CAN SEND / RECEIVE data (internet), FourSquare can not identify where I am...


Suggestions?
25th August 2012, 01:33 PM   |  #2  
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actually it seems like a problem with your network\sim card.
i'd try first to ask other users under the same network if they experience problem and replace the sim card
25th August 2012, 02:09 PM   |  #3  
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Backup Data factory reset ..
Try with a different sim card are the usual first steps .

jje
25th August 2012, 03:39 PM   |  #4  
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Quote:
Originally Posted by parkerfairfield

Strangely, I CAN send data thru the network, but can not receive or make calls.

Is your IMEI correct?
25th August 2012, 08:13 PM   |  #5  
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Quote:
Originally Posted by JJEgan

Backup Data factory reset ..
Try with a different sim card are the usual first steps .

jje


I forgot to update my post.

I used a friend's SIM - which is on the same network (China Unicom) as my SIM card is ...

I had the exact same problems.
25th August 2012, 08:18 PM   |  #6  
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One of my friends tells me I should re-install a ROM ... What do you think?

QUESTIONS:
Should I try to root the phone?

I ask because (a) it's not yet
(b) I want to back it up, and understand Titanium Backup to be the best ... but that needs to be rooted.

FINALLY - how woulld you back it up? I hate losing data.

I have a huge DROPBOX account ... but don't see a great way to use that to back it up.

Thanks.
25th August 2012, 08:27 PM   |  #7  
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i've a similar problem but with sms..
26th August 2012, 01:24 AM   |  #8  
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Quote:
Originally Posted by sasogf

i've a similar problem but with sms..

Awesome. Good for you.





Quote:
Originally Posted by parkerfairfield

One of my friends tells me I should re-install a ROM ... What do you think?

QUESTIONS:
Should I try to root the phone?

I ask because (a) it's not yet
(b) I want to back it up, and understand Titanium Backup to be the best ... but that needs to be rooted.

FINALLY - how woulld you back it up? I hate losing data.

I have a huge DROPBOX account ... but don't see a great way to use that to back it up.

Thanks.

If it's within guarantee then just take it back to the store. Sounds defective and rooting would void your warranty on a faulty device. You'd probably find that rooting and a custom rom would not help anyways.

My $0.02 is take it back to the store, but back up your setting to Samsung drive thing. It backs up message too.

Sent from my GT-I9300 using xda premium

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19300, china unicom, mobile network
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