Facing an Issue of Not Receiving SMS After SIM Change – Here the Reason

SIM Change, getting a duplicate SIM card for your existing mobile number is not a big deal now. But, after exchanging or upgrading the SIM card, you may not receive any SMS on your new SIM card. Many users are used to logging the complaint with customer care regarding this.

But it is not at all an issue with your operator such as Airtel, Idea, Vodafone, etc. As per TRAI’s rule, any duplicate will not be able to receive any SMS for 24 hours from the time of activation. This will happen for BSNL users in some cases if upgrading the current 2G or 3G SIM card to BSNL 4G SIM.

Incoming SMS get blocked after SIM change

The new rule says that any duplicate SIM issued, will not receive any SMS on that particular Number for the next 24 hours from the time of activation. However, the outgoing SMS will work like before. You will also receive calls and can make outgoing calls, data, etc. The only issue is with the incoming SMS. It includes all the categories such as personal SMS, OTP’s, and other promotional SMS’s.

How to Fix the Issue of Not receiving SMS on your Number

First of all, it has considered a security feature and not an issue. Hence, the resolution is automatic. The problem gets resolved automatically after 24hrs, and you will start receiving SMS after that. For this, no need to contact or log a complaint with customer care. Just wait for one day, and things will get sorted automatically.

Reason For Blocking Incoming SMS after Upgrading the SIM

Currently, as per the new rule, the SIM card of any operator, whether it is of Airtel, Idea, Vodafone, etc. will hold a temporary ban of Incoming SMS for 24 hours. It has implemented to ensure the safety of the user. There are several cases in which SIM fraud has reported, which resulted in the loss of money from the Bank account etc.

Fraud action takes place in which thieves and criminals may take a duplicate SIM of users. The original SIM user will be unaware of this. Once a duplicate SIM card is issued, the original SIM with the real person will get automatically disconnected. Further, all the calls and SMS will be received on the duplicate SIM card with the criminals. They can use this to receive OTP from banks to steal money from the bank account of the SIM owner. Since the Number gets disconnected during this time, the user will not get any information about this.

To avoid this type of fraud activity, the temporary blocking implemented if you are taking a duplicate SIM. So, no such kind of cyber fraud activities can take place during these times. In the meantime, the original SIM owner can report the issue with its operators. So that the duplicate SIM can be deactivated, if the real owner did not take the duplicate SIM.

Drawback of the SMS Blocking with the Duplicate SIM

The feature is to ensure the safety of the customer, and however, for the original user, it may cause some issues. During the 24 hours, the user will not receive any SMS, including regular SMS, OTP, etc. If you are frequently using the bank account for online transaction, then this might cause a problem. You will not receive any OTP from the bank so that no transaction can be made during these times. Also, if you are about to receive any vital SMS, then also you may miss them.

Another important thing is that you cannot register for any applications such as WhatsApp, Viber, Duo, etc. using the OTP message during this time. Alternatively, WhatsApp and some other apps provide OTP over call, that can be used to solve this issue. But for all others that need OTP over SMS, you need to wait for 24 hours.

Note: As a result of some network outage and other technical issues, some users are reporting that they are not able to receive the SMS even after the 24hrs period. If the same happens to you, then what we recommend is to contact the customer care immediately and report the issue.

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14 thoughts on “Facing an Issue of Not Receiving SMS After SIM Change – Here the Reason”

  1. This should change… If it is the same owner. Y can’t u release the services… Has u take id proof of the person.. So that u can activate the sim

    • It is kept for an added security. There are cases happened before in which the duplicate SIM of the owner has been taken by fraud group in order to receive OTP after hacking their credit/debit card details.

      To avoid this case, the no SMS period added for the duplicate SIM. But sure, it will be a headache for the real owner.

  2. After activating duplicate Airtel SIM card …..even after 22 hrs I can not able to send SMS…I understand about blocking the incoming messages for security reasons, but there is no point in blocking outgoing messages!

  3. I was replaced my airtel prepaid on 30th may 2020 sim due to unable to send or receive any messages. Even I tried for porting that also not working..

    Its Wonder till my problem was not solved 🤷‍♂️ so here if any expert candidate available can you please suggest what I can do??

    • Then some issue with you connection or phone. Hope you already tried sending message using another handset with your sim inserted. if not, please try that. Also make sure an active unlimited plan or any smart plan with enough balance to send SMS. However the incoming SMS should work even though u don’t have any plan active. You need to contact customer care for this issue if still persist.


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