Unable to send text messages - iphone 6s

Hi munna70777,

Thank you for contributing to the Apple Support Communities.

If you can't send messages to certain contacts, try these steps from If you can't send or receive messages on your iPhone, iPad, or iPod touch:

If messages won't send to a certain person or you need help with group messages

Sometimes your messages won't send to a particular contact, or you might have issues with group messages. For example, you might reply to a group conversation and receive your own message. Or you might get a new phone number and see your old one listed as a recipient in an existing group conversation.

Delete the conversation* that has the issue and start a new conversation:

1. Open Messages and look at your list of conversations.
   
2. Swipe from right to left on the conversation you want to delete. Then tap Delete.
   
3. Open Messages, tap , and enter the phone number or email address of your contact or contacts.
   
4. Write a new message and tap send.
   

*When you delete a conversation, you won’t be able to recover it. If you want to save parts of conversations or their attachments, you can take screenshots. You can also touch and hold an attachment or message bubble, then tap More > Save.

Sincerely.