Odd Problem: WiFi On=Network like"OFFline" but with signal... - Galaxy S III Q&A, Help & Troubleshooting

Hi dudes,
i have a normal GT-i9300 NO BRAND. From the beginning i started with Ultima Rom and until version 12 and a provider CHANGE with the same number (from Wind to TIM, Italy) i never had a problem...after,starts the odd's show:
if turns on the WiFi...my device is like OFFLINE,is not reachable .KEEP ATTENTION: the signal is present, like -85dbM 14asu.But from the moment I do a phone call or i send a SMS...device turns back reachable, for a X period of time,after that: "offline" again.
I tried:
change modem (latest,oldest...)
downgrade of Ultima Rom and modem
upgrade until Ultima Rom V16 (4.3..)
pass to CM11 temasek unofficial V45 (4.4.2 GREAT ROM...)
pass to STOCK SAMSUNG ROM (with odin,latest version...my God,tried only for the test and quickly raging i came back to temasek)
used the same device with a different TIM sim
I did a deep wipe for new ROM installation,with Philz recovery...
NOTHING WORKS, the problem rest.
To Do:
try a different provider sim...for example WIND or 3 (for exclude a Provider problem...something related to communication protocols)
Try my TIM sim in another GT-I9300 always with CM11 temasek unofficial.(for exclude an HARDWARE problem...waiting for a my friend with the same device and rom)
Weird:
it seems that this problem is only in my home because from my workplace (another radiocell) i'm reachable also under wifi connection.
CALLED:
I called to my customer service TIM and they did a "format" of my sim and "account"...but nothing changes. They said that in my radiocell the signal is weak, they know that but they can't do nothing.
I REMEMBER that the problem began from the SWITCH from WIND to TIM,that not wanted,happened during an upgrade of Ultima ROM...
SO,the problem is of my device? Sim? Number? Provider?... WHAT THE H****?!
ANY SUGGESTIONS!?!??!

---

Skyfinder said:
Hi dudes,
i have a normal GT-i9300 NO BRAND. From the beginning i started with Ultima Rom and until version 12 and a provider CHANGE with the same number (from Wind to TIM, Italy) i never had a problem...after,starts the odd's show:
if turns on the WiFi...my device is like OFFLINE,is not reachable .KEEP ATTENTION: the signal is present, like -85dbM 14asu.But from the moment I do a phone call or i send a SMS...device turns back reachable, for a X period of time,after that: "offline" again.
I tried:
change modem (latest,oldest...)
downgrade of Ultima Rom and modem
upgrade until Ultima Rom V16 (4.3..)
pass to CM11 temasek unofficial V45 (4.4.2 GREAT ROM...)
pass to STOCK SAMSUNG ROM (with odin,latest version...my God,tried only for the test and quickly raging i came back to temasek)
used the same device with a different TIM sim
I did a deep wipe for new ROM installation,with Philz recovery...
NOTHING WORKS, the problem rest.
To Do:
try a different provider sim...for example WIND or 3
Try my TIM sim in another GT-I9300 always with CM11 temasek unofficial.(waiting for a my friend with the same device and rom)
Weird:
it seems that this problem is only in my home because from my workplace (another radiocell) i'm reachable also under wifi connection.
CALLED:
I called to my customer service TIM and they did a "format" of my sim and "account"...but nothing changes. They said that in my radiocell the signal is weak, they know that but they can't do nothing.
I REMEMBER that the problem began from the SWITCH from WIND to TIM,that not wanted,happened during an upgrade of Ultima ROM...
SO,the problem is of my device? Sim? Number? Customer?... WHAT THE H****?!
ANY SUGGESTIONS!?!??!
Click to expand...
Click to collapse
my guessing is that the problem is the sim card, probably damaged. you should try another sim card.

---

done yet, I wrote it I the "tried list" ... Another tim sim and the problem rest
Sent from my GT-I9300 using xda app-developers app

---

Skyfinder said:
done yet, I wrote it I the "tried list" ... Another tim sim and the problem rest
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
yeah sorry, it was late and i was tired, didn't see that. well, it might be the antenna of the phone, you should go to a gsm service, they have the necessary stuff to point out the problem, even if it's hardware or software.

---

Could even be the sim holder .

---

I'm thinking that is an ANDROID or Modem problem related...specially with TIM communication protocols.
Is like if where there is a low signal,and you use Wi-Fi...device don't give energy to radio antenna,but to wi-fi. When you call or sending SMS,the antenna takes more power and the device is now reachable...
I should try a real old ROM with a real old modem...ufff...is all so boring -.- (i know,exist nandroid,but still boring is!)

---

Skyfinder said:
I'm thinking that is an ANDROID or Modem problem related...specially with TIM communication protocols.
Is like if where there is a low signal,and you use Wi-Fi...device don't give energy to radio antenna,but to wi-fi. When you call or sending SMS,the antenna takes more power and the device is now reachable...
I should try a real old ROM with a real old modem...ufff...is all so boring -.- (i know,exist nandroid,but still boring is!)
Click to expand...
Click to collapse
if you have a rom with modem that changed your efs partition to efs v2 and try to flash a rom that has modem with efs v1 you will loose your IMEI and S/N , unless you have a backup of efs v1.

---

darkmage93 said:
if you have a rom with modem that changed your efs partition to efs v2 and try to flash a rom that has modem with efs v1 you will loose your IMEI and S/N , unless you have a backup of efs v1.
Click to expand...
Click to collapse
THANKS FOR REMIND ME THAT! I've the back up of old IMEI and S/N Really thanks!