Seeking Help No incoming/outgoing SMS on Airtel 4G (Upgraded from Telenor 3G)

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Endgame

Endgame

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Today I got my Poco F1. But the biggest problem is one of the Sim card (Airtel) isn't getting any SMS (incoming/outgoing calls are fine). The message appearing in notification: Can't activate Sim Card (couldn't send activation SMS to gateway). Please help.
Edit: Thread title changed after knowing the problem source
 
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Did you upgrade your Sim from 3G to 4G? If yes, then wait for 24 hours.
 
Give all permission to Xiaomi sim actovation service... Settings - installed app.. Search for "Xiaomi sim actovation service".. By doing this, problem solved for my Whyred ...
 
Same problem I faced with my Airtel 4G when I brought my MI A1 last year. I have contacted CC last time and they did something but after 72 hours I started receiving all the messages.
 
Checked by inserting sim in feature phone, still no incoming/outgoing SMS.
 
sumitroy said:
That's because of Sim upgrade. After Sim upgrade, for security reasons SMS service is disabled for 24-hrs and it should automatically activate after 24- hrs. Contact CC
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Bro, is this to avoid banking fraud?
 
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