Samsung Galaxy S II problem with incoming calls - Galaxy S II Q&A, Help & Troubleshooting

For the past week, I've been having some problems with incoming calls on my Samsung Galaxy S II. Every time I try to answer a call, I immediately get a "Call Ended" message. All the calls I get seem to go straight to voice mail but i don't have the auto reject option enabled. I don't have any problems calling other people and when i put my SIM card into a different phone, it works just fine.
The problem arose after I flashed the XWKJ3 firmware onto my phone. I've tried reflashing the firmware and I also tried to flash other firmware versions but the problem persists. I've spent hours on google looking for a solution but i failed to find one.

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The issue is, when I hit the video call button, the ring goes and when the contact answers the call I get a message the caller ended the conversation. Occasionally I'd see a still image of the caller and the call disconnects.
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[Q] some SMS not received on Samsung SIII i9300

I have this problem with my Samsung S3 i9300, running on it's stock ROM, the phone functionality is fine. (not using on data network or wifi)
Means phone calls are able to be made and received without any problems.
SMS can be sent and received as well, but sometimes, messages are not received!
I've switched the SIM to another phone, and then all the messages are coming in...
I've changed the SIM to a new one but still the problem remains.
Later on, I've flashed the phone to another ROM (S4 Revolution). It was working for awhile then it's happening again.
Now, running on CyanogenMod 10.1.3, it's been fine for awhile until yesterday, with over 5.3k of SMS, certain messages aren't coming in again.
Have any one of you had this issue before? I mean SMS is like the most basic function in a phone and it's not perfect on my S3!
For the record, the application there aren't any application installed prior to that problem, and there are more than 1gb of memory available.
I guess formatting the phone or resetting it would help, or clearing all of the SMS, but would I need to do it everytime? hmmm...
kevinpunya - Malaysia

[Q] No keypad tones during call - i9300 Samsung Galaxy S3

Hi all,
I´ve just changed networks on my UK international i9300 Samsung Galaxy S3 so I can use a H20 wireless (AT&T network) SIM.
I tried a few different modems via the GetRIL app, but couldn´t get any to match. I then used GalaxSim Unlock to unlock the phone. The IMEI was temporarily removed but I restored the original modem via GetRIL and it appeared to be unlocked still.
I can now dial with the phone but the only difference is the keypad tones fail to work during the call. When dialling, the numbers come up on screen correctly and make the normal keypad tones. The problem is during the call when an automated line will ask for numbers to be input. They will come onscreen but make no noise, so the other end considers I´ve not entered anything.
There are no settings available to alter, I´ve tried a reboot etc. but nothing has helped. Í´ve had a look on Google but I can´t see anyone else who´s had this problem. Any ideas?
P.S. It is possible the RIL/modem works for texts, calls but isn´t quite the right one to produce DTMF dial tones?

S21 Intermittent SMS Fail

Hello folks.
I'm having an issue with my phone, S21 Unlocked SM-G991U1 (purchased directly from Samsung). This post might be long because I want to include all info to help answer questions that I might already have eliminated possible issues on.
I bought the phone March 18th and it's been working perfect up until exactly 4 days ago. What's been happening is that it will fail to send sms/texts randomly throughout the day. I can be having a conversation with someone then suddenly the texts I'm sending will begin to fail and they will get the ! or endless spinning circle depending which messaging app I'm using. I tried several apps (stock messaging, Google messages, textra) to eliminate the possibility of it being a specific one, it happens with all of them.
I then switched my sim card to another phone for several hours (S8) to see if it was a network issue... The S8 works perfect, no failed texts. As soon as I switch the sim back to the s21 the messages will fail again.
This happens at any given time, it will go from working fine for about 5 messages in a row then fail on every next message for about 10-15 mins then start working again.
This does not affect MMS or phone calls. Only SMS.
I'll also be able to receive any sms messages sent to me without issues at any time, even when outgoing ones fail.
I've tried resetting Network Settings to no avail.
I just did a complete factory reset, also no to avail. I'm lost here.
The phone has the latest update and had been working perfect up until 4 days ago. I can also say that I don't think the latest update was the cause because it started the day before I received the push notification for the update.
I'm on AT&T prepaid.
Please let me know if you have any questions I might not have covered or if you've encountered this issue before or what might be the fix. Thanks in advance!

Bought unlocked S21, can do everything but make calls

I recently bought a used and unlocked S21 and everything works except for making calls. I am able to send/receive texts, use data, etc but when I go to make a call it instantly ends. Incoming calls go straight to voice mail. I tried dropping in the sim for another S21 from a known working S21 phone and the same thing happened so this is probably a setting on the phone or something. Is there anything that I can/should do to fix this?
Ok well a software update seems to have fixed things.

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