Sorry This Service Is Not Available

Unfortunately, this service is not available. When to send an SMS? ۔

I haven't been able to call a friend in a few days. He says the line was cut so that someone else could call him. Now, every time I text him he says this service is not available. Others can write it and he can write me. Thoughts?

update

An attempt was made to delete and delete all text history with this person.

Try removing and re-inserting the SIM card. If that doesn't work, try resetting your APN.

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Sorry This Service Is Not Available

Unfortunately, this service is not available. When to send SMS? 3
I haven't been able to call a friend in a few days. He says the line was cut so that someone else could call him. Now, every time I text him he says this service is not available. Other people can write it, and he can write it for me. Thoughts?
To update
An attempt was made to open and delete all text history with this person.
Try removing the SIM card and inserting it again. If that doesn't work, try resetting your apn.