International roaming caller ID not working

nicos7

    I am in Greece.  All incoming roaming calls from the US show as either French or Italian numbers or No Caller ID.  This has been going on for 3 weeks and has never happened in previous trips.  I have called repeatedly t-mobile but nothing has been rectified.  Any suggestions?

      All replies

      • drnewcomb2

        Re: International roaming caller ID not working

        Caller ID is not guaranteed when roaming. Have you tried changing the carrier you are roaming?

          • nicos7

            Re: International roaming caller ID not working

            This is my 6th trip to Greece with t mobile. Caller ID worked fine all five previous times

            the local carrier COSMOTE is a subsidiary of Deutche Telecom which owns t mobile, so it is very ironic that caller ID does not work.

             

            I suspect that the reason is that the calls are being forwarded through European numbers for cost saving purposes but this is completely unacceptable when it results in malfunctioning caller ID

            By the way, when I make international calls from the states, my US number shows up as a European number  to the people I call. These problems are completely unacceptable and I will have to change carrier if the problem is not immediately resolved.

              • drnewcomb2

                Re: International roaming caller ID not working

                So, have you tried to roam Vodafone or Wind? What happens?

                  • nicos7

                    Re: International roaming caller ID not working

                    It does not allo me to connect to either.   When I go to manual network selection, I can see both Vodafone and Wind but when I select either of them it says no service.

                      • drnewcomb2

                        Re: International roaming caller ID not working

                        Well, it was a thought. Don't know how to help you with that caller ID problem or what might have caused it. BTW, I'm just a customer, like you, not an employee.

                        Does your phone use LTE for making calls in Greece or does it fall back to 3G? I'm not sure how roaming calls over LTE are processed. I used to have a pretty good grasp of the theory on the handling of GSM and UMTS calls. For GSM and UMTS calls, the phone is assigned a temporary local number, which is passed to T-Mobile's switching system and the call is forwarded to that number. That would be a Greek number. I have no idea how a French or Italian number would get into the process.

                          • nicos7

                            Re: International roaming caller ID not working

                            I am in the States now but I believe it was 3G. Also please keep in mind that when I do call a Greek cell number from the states, my t mobile number does both show up. Instead a different European number from various different countries shows up, so people have no idea that it is me calling. Only when I call land lines by US number shows up correctly.

                  • tmo_mike_c

                    Re: International roaming caller ID not working

                    Wow, that's really strange. Is this happening with US numbers you have saved in your phone? I'd say filing a ticket for our engineers is the next step, but I'm curious about exactly what you were told after you called.

                    • nicos7

                      Re: International roaming caller ID not working

                      I found these answers:

                       

                      Muhib Afzal, OD | HR Coordinator at MTN Afghanistan (2008-present)

                       

                       

                       

                      It is due to SIM box. Simbox or Interconnect Bypass Fraud is one of the most prevalent frauds today, costing the industry some USD3Billion. Calls made via the internet are sent to Simboxes (machines that house SIM cards) which redirect this illegal VoIP traffic onto mobile networks. Fraudsters effectively bypass the inteconnect toll charging points to exploit the difference between the high interconnect rates and the low retail price for on-network calls, thus avoiding payment of the official call termination fee of an Operator or MVNO.

                       

                      Anton Dushko, lives in Saint Petersburg, Russia

                       

                       

                       

                      Because your provider cuts expences (one may say “tries to make calls cheaper for you”, but that's just the flip side) and routes your call via some substandard route, like cheap VoIP gateway in recipient's country. The backbone provider that gateway is connected to may prohibit gateway owner from landing international calls, but they do it anyway, without putting your number to “caller’s number” field when the call is established, to avoid getting caught.

                      Some providers may give you several choices of routing with varying quality and cost, others just route your calls as they wish (including that not-quite-legal gateways for some destinations). In the former case it may be possible to select default route used when you just dial the number, or/and you may select what route to use for the call by dialling some prefix before the actual number.

                       

                      If these answers are correct, this situation is completely unacceptable.  Nobody knows it is me when I am calling from the States to Greece and I have no idea who is calling me when I am travelling in Greece.  This needs to be corrected immediately or I will file a complaint with the FCC.

                       

                       

                      • dorkatm

                        Re: International roaming caller ID not working

                        Hi all, I have the same problem!!!  I have T mobile USA number and I chose it because of the best rate for calling to my country - Poland. Everything has started January this year - when I'm calling to friends or family, they see my number as some random number within European Union (Holland, Romania, Hungary, Ireland, etc etc etc). So many times I was talking with customer support and it still isn't fixed. People are afraid picking up my calls, because they think it is scam. I disabled WiFi calling and it didn't helped. Correct caller ID is a most basic function you may expect from mobile carrier.

                         

                        What are the next I should take? Should I reach FCC as well to raise this issue priority?

                         

                        Thanks for helping me!