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How to change the hands free mode to normal mode on Tata Indicom CDMA Huwaei c2831 mobile phone

Trouble in changing the hands free mode to normal mode on Tata Indicom CDMA Huwaei c2831 mobile phone

I am using a Tata Indicom CDMA connection. The mobile phone used for this is of model  Huwaei c2831 cdma.  This has a FM radio option, but to hear the programs you have to conect the headset which acts as an antena.
When it is connected the phone is automatically changed to HANDS-FREE mode and normally it should be reverted to Normal mode when the head set is unplugged. In my case even after unplugging of headset, the phone is still in hands-free mode and its shows a logo image of headset  on the middle left of phone screen. When a Call comes, I cannot hear what is said by the person on other end, but he can hear what i am saying. If I connect the headset I can hear the other person.

Following are the different actions  I took.

1. I had gone to the options and set off the Radio mode. Then switched of the phone and then switched on it.

2. Switched off the phone while talking and then switched on t

3. switched off the phone removed the SIM card and then switched on

4. I tried plugging and unplugging the headset constantly

5. I tried factory reset

a.  Switched off the phone removed the SIM card and then switched on it, Since there is no SIM now, it said only SOS allowed. So i selected SOS and then typed "##258741" and selected Call option, then it gave a warning "Only emergency calls are allowed"

b. Switched off the phone with out removing the SIM card I switched on it, then i Dialed "##258741" and selected Call option, then it gave a warning "Factory reset continue" , I go woth  "OK"  and phone setting was restted to factory standards. ( This action deleted all data that was stored in the Mobile including some mobile numbers and saved messages. Som make sure you have copied your important data before the action)


In most of the cases any of the above action will fix the issue. but in my case all this failed and I doubt of an software / hardware error.


Update:
Finally the issue was found. There was some sort of particles  found in the headset plug point which falsely sensed the phone as headset attached.
I took the mobile to a service center and he cleaned the plug point  and now its working fine. :)




Useful codes for Huwaei Phone:

##1857448368 version
##258741 Hard Reset / Full Restore
##147852 Test Mode
*#06# ESN
##5674165485 NAM SETTING & HARDWARE TEST
#8746846549 NAM SETTING & HARDWARE TEST
##1168453865 NAM SETTING & HARDWARE TEST
##3515645631 monitoring debug
##8541221619 NV OR RUIM

Please post your suggestions as comments. Thanks :) 

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