[General Questions and Answers] thbrown:
I am looking for some information regarding a problem I am experiencing with my phone, I have 3 questions regarding it. I have stated them at the end of this lengthy post.

My phone is zte grand x2 model z850 and android build is 5.1, carrier is pcmobile in Canada.

The problem is that my android phone seems to work OK and receives calls correctly, but my doctor office, hospial booking office, and phones belonging to my workplace receive a tone followed by some type of reaching a disconnected number. My phone calling log shows no record of calls being received to phone.

The troubleshooting steps are sent email to pcmobile and received response to do a battery reset, pull out battery and sim card for at least one minute and reinstall. If it doesn't work call their customer support and get put through to tech support.

That did not work. Call to the tech support says that all 0:00 second calls end in response to some type of code (mentioned a specific code but I forget) and that it means my phone is responsible. She said android phones allow for rejecting calls based on various categories like toll free originating and such. And that the phones calls not getting through likely belong to a category I have blocked. She mentions just goto phone menu, settings, and something like call block, call reject and I will most likely find something there. If that doesn't work to do a backup and factory reset. To do that she says I need to call zte for help as she isn't allowed to help with it.

My zte phone interface only shows call barring settings with a few things like all incoming or incoming roaming, outgoing or outgoing roaming and that is it.

However it is possible that I came across via a web search a USSD code to ban telemarketers and used it. I just don't no what code it was or even if I did such a thing.

Anyway I called back their customer service to maybe get further help and had specific phone numbers and times of calls that were rejected by disconnected number messages from my workplace. To see if the problem could be isolated at my phone as a reason or maybe in the network somewhere. And was also wanting to know how I can unset the call reject if I have no interface to do it or undo it. Maybe even get confirmation that the noted calls are actually making it to my phone or getting dropped in the network. The new customer support first asked if it was a ported number and since it was, he checked with someone to see if it was a problem. The porting people said all calls were routed correctly through to my phone, but the customer support guy said there was no way to verify if my specific noted calls were included.

He mentions their tech support did not help with actual phone troubles, but he suggested I get another sim card and phone and use them in varios combinations with my phone and sim to get the working/ not working situations and isolate the problem. This I have not done yet as it seems like a lot of expense and jumping through hoops trying to fix a problem that seems like it should be able to be verified in a phone setting log somehow. He refused to put me through to tech support when I said I wanted him to anyway.

My emails with zte have them requesting I do a backup and factory reset, if that doesn't work then try a new sim card, if that doesn't work then book my phone for a repair with them.

So my question number 1 is:

Is there a USSD code that allows me to see settings or logs of such a call reject being used. I have tried *35**# which is supposed to show "incoming call barring" and it responds "Call barring Service has been disabled." My phone user interface doesn't provide for this as best as I can tell.

My question number 2 is:

What is the USSD code that I might have used to try and reject telemarketers which might issue tones that might indicate a disconnected number. I'm thinking this is the most likely reason for my troubles. I have been unsuccessful google searching for what I may have done. I find info on various USSD codes at this forum and elsewhere. But I'm not finding anything specific to help. I thought the *35**# would have helped but it doesn't. It is very possible I did do something like this with a USSD code which is causing my trouble.

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Part 2 of this question is what would be the USSD codes to see the status or to unset such a thing.

My question number 3:

If there is no way to set status or see the status of call barring and rejecting logs or settings of the phone. If I do a phone reset, how is it possible that it could be the sim card instead. Does the sim card actually store call rejecting and barring settings as well.

Part of troubleshooting this involves me contacting third parties such as work, doctor, or hospital and asking them to try and call me and if not successful contact me someway else and tell me it was unsuccessful. I really doubt any of them want to do this for me more than once or twice. So I'm trying to gather info and limit my number of attempts. It would be real useful to be able to look up logs or settings somehow.