Signal Drops then NO SERVICE then Invalid SIM Error

**Ramasubramanian** · 04-22-2011, 09:46 AM

Dear All,
Could any one help on this issue...

When I enable 3G network service, the signal slowly drops (when I am in EDGE network the signal is full), then at one point it completely drops and one bar alone is there and in a minute that too goes off and says "NO SERVICE" and after a minute it says "NO SIM CARD".
To over come the problem I have to reboot the phone every time...
When I see it is going to 1 bar, I will disable the 3G network and within a minute it gains the signal...

My observation :
The problem is coming only when I enable the 3G network service.. today I restarted around 4 to 5 times :-(..

Could anyone help to over come this problem... Given my device information...

Device : Iphone 4 (Locked to AT&T)
Firmware : 4.3.1
Baseband : 1.59
Jailbroken : Yes (unlocked through ultrasn0w 1.2.1)

**battlecrushr** · 04-22-2011, 09:48 AM

are u using t-mobiole..
if so then u cant use 3g cause of att and tmobile 3g bands are different.

its impossible to get 3g on tmobile iPhone

and BTW I love ur name and email lol

**Ramasubramanian** · 04-22-2011, 10:12 AM

No I am using in India Vodafone network....

**Stray** · 04-22-2011, 10:13 AM

It might be the same as tmobile

**Ramasubramanian** · 04-22-2011, 10:22 AM

Is there any solution for this (through cydia?)? Please help me....

**battlecrushr** · 04-22-2011, 10:22 AM

ya it sounds like it...

**Stray** · 04-22-2011, 10:23 AM

Originally Posted by Ramasubramanian

Is there any solution for this (through cydia?)? Please help me....

No but edge isn't a big deal

**battlecrushr** · 04-22-2011, 10:24 AM

ahh it is
well depends on where u are.
where i am edge speeds suck so bad..
but 3g isnt that bad..

**Stray** · 04-22-2011, 10:25 AM

Originally Posted by battlecrushr

ahh it is
well depends on where u are.
where i am edge speeds suck so bad..
but 3g isnt that bad..

Yeah over here edge speeds are almost as good as 3g but im used to the "4g speeds" now with tmobile

**Ramasubramanian** · 04-22-2011, 10:29 AM

Please help me in getting this problem fixed.....

Could u please help in getting this fixed...

**Stray** · 04-22-2011, 10:31 AM

Do you know what frequency your service provider uses for 3g?

**Ramasubramanian** · 04-22-2011, 10:34 AM

Sorry I don't know...Its vodafone India (city : chennai)

**Stray** · 04-22-2011, 10:35 AM

Well ok i guess ill research it for you

**Ramasubramanian** · 04-22-2011, 10:36 AM

Thanks! Sorry I am not that much technical guy...

**Stray** · 04-22-2011, 10:40 AM

No problem looking up now

Ok you will just need to deal with edge as it only supports edge where you are from rather where your carrier is

**douflag** · 04-22-2011, 11:04 AM

Hmm...this is strange. Vodafone India does support iPhone 4 for 3G. It also has 3G service in the Chennai area. Could it be because your sim card is too old?

**Stray** · 04-22-2011, 11:05 AM

I just checked on there website tho

**douflag** · 04-22-2011, 11:19 AM

Originally Posted by Str4y

I just checked on there website tho

Me too. Go to Online Recharge|Prepaid, Postpaid Mobile Services|Callertunes|Vodafone India. Click on the red tab that says 3G world and it'll ask you for your location. Input Chennai, and you'll get to their 3G page. It'll have a link for compatible handsets.

Vodafone India 3G Map

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