Has not been able to send sms for the last 3 days. Am able to receive sms but not send. Have tried putting sim in another mobile but still not able to send but can receive. It's not the mobile as I've tried it with another sim card and it works.
Welcome to the community!
We're sad to know that you're having issues with your mobile service. We did an article that you may find helpful.
This will guide you a basic troubleshooting related to Mobile SMS issue.
Please see link below. Having trouble sending SMS?
Let us know how it will go and should you require further assistance. Cheer!