This card number does not exist

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Recently, I saw some Nokia forums discussing the phenomenon of "this number does not exist" when sending short messages. Some friends who did not understand mistakenly thought it was software. BUG, actually not the case. This issue has been discussed in depth on the

Nokia 6610

forum. Let me explain again: Generally speaking, there are two such situations.

1. Interoperability issues between China Mobile and China Unicom. Taking Nanjing as an example, for a period of time in 2002,

Nanjing Mobile

users often received the message "This number does not exist" when sending calls to China Unicom users. This kind of interconnection problem belongs entirely to the network and has nothing to do with mobile phones. Such situations will occur with mobile phones of various brands. Happily, this situation is now rare as connectivity issues are resolved.

Two. It is the "this number does not exist" that everyone often encounters. For this situation to occur, the following conditions need to be met.

Let me

analyze in detail

how the problem occurred.

1. First of all, both A and B's mobile phones must support "providing the same center reply", and the SMS sender A must activate this function. After activation, "A's SMS center number" will be added to the additional information of the

short message

sent by Party A for Party B to use when replying to this message (presumably Foreign networks have this kind of design and need to be provided by the other party). At the same time, only the mobile phone of receiver B also supports this function (no activation required), so that correct reading and identification can be performed. If the mobile phone of recipient B does not support this function, it will not recognize the attached SMS center number and will choose to ignore it.

3. As we all know, to send a short message, you first send the short message to the server of your SMS center number, and then the server forwards it to the number you want to send. If A and B are both Nanjing Mobile users and have the same short message center number, and B uses A’s short message center number as B’s own short message center number when replying, the text message can still be sent normally. Because the SMS center numbers of A and B are exactly the same. Only when the SMS center numbers of A and B are different, for example, the sender A is

Beijing Mobile

and the replying party B is a Nanjing Mobile user. When B replies to the short message, How is it possible to send a message if A's short message center number in Beijing is used as his own short message center number? Of course, "This number does not exist" must be prompted, because Nanjing Mobile users cannot send the short messages that need to be sent

to the server of Beijing Mobile's short message center.

Or

1. The other party has stopped or canceled its account

2. The other party has activated

incoming call restrictions

3. The other party enables the firewall or blacklist function 4. The number is entered incorrectly

Please accept the answer and support me.