Unable to send text messages

avnishymca wrote:

Unable to send text messages

Are these SMS (green) messages? Or iMessages (blue)? What happens when you try? Are you getting any error messages? If so, what are they?

See also this article:

If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support

SMS, MMS, Call Forwarding, Call Waiting, Call Merge, Conference Call, Hotspot, VoiceMail all are Carrier Specific features. Contact your Carrier (Cellular Service Provider), the agency who issued the SIM / eSIM to you.