Have you checked to make sure your APN settings match exactly the APN settings from your Network provider.
Is it about normal msg or mms?
Have no idea, user hasn't replied. But usually it's an APN issue most times.
In addition to this, @SaxenaArpit can you also tell us What Sim and what Recharge pack are you using , I ask because some of the recharges which had sms services, might have removed outgoing sms feature.
I recently had this same issue with Airtel Sim and Recharge of ₹ 79 INR where outgoing sms services were removed which was available a month ago, and I wasn't aware of it and did a recharge, and when I tried to activate a banking app that has to sent some messages for the confirmation, it wasn't able to. I got errors many time. Than I got message from Airtel side that my Recharge pack doesn't support Outgoing message service anymore and suggested me to do Rechange with any of the available Unlimited pack to be able to use outgoing sms service .
Guys I am using Jio prepaid sim. The recharge pach is also perfect. I have checked with jio customer support as well.
It was working fine but somedays back I was not able to send send and receive sms.
Yesterday again I tried some settings and switched off the wifi calling feature of the sim....and it worked.
So it is resolved as of now. Thanks 👍
Glad you got it solved.✌️
[Community Workshop X Shot On OnePlus October] – Flatlay Photography
by Elyn Lu, 2021-10-01