As of today I can't send SMS text messages in airplane mode

I agree with your first sentence. I have all bars on WIFi icon, I'm at home and cell data is turned off through airplane mode. As I said this has always worked until today. Tried different WIFI servers here and same error. Just tried to make a call on WIFI and get the same error.

I receive emails and can browse the web so I have a valid working WIFI connection

I presume that your screen is showing “XM WiFi” which one would think would mean that you have successfully connected or pinged an XM server?

So they are probably having some sort of server problem. If things don’t go back to normal pretty soon I suggest the following. 

1.) Power off, then power on your phone. Check if you can SMS or call. 
2.) Reset network settings. Check if you can SMS or call. 
3.) Turn off WiFi calling and then enable again. You may have to turn off airplane mode for this. 

Good luck. 

I'm on android and don't have xfinity modem (own my own) never have seen “XM WiFi” on my phone which I've had for 3 yrs. just the radar bars. I was wondering if there were any driod os updates.

Go to your browser and enter “WiFi calling on xxxxxx” where xxxxxx is your phone make and model, and you should find additional information for your particular phone. 

Check out this link from Verizon:

https://www.verizon.com/support/troubleshooting-wifi-calling-android-video/

The setting on phone are provider specific with xfinity. The settings in that video aren't even available on my phone

I am sorry for the confusion. Enabling Airplane Mode on your mobile device should disable all cell and WiFi functions on your phone. This should block all incoming and outgoing signals. https://comca.st/3pGafuR. I hope this helps. Please let us know if you need help with anything else.

It's not a problem of confusion on my end, I go into airplane mode then turn on wifi.. This config has worked fine almost all the time for making calls and sending texts. It seems to change every few days lately. As I commented last week every thing went back to normal: in airplane mode and wifi on I could send both types of text and make calls. Today when in airplane mode & wifi enabled I can not send send MMS text or make calls but can browse the web which proves I have an internet connection. Today even when not in airplane mode I can not send MMS text.

Hey there, thanks for the information, I'm sorry to hear the Airplane mode trouble is ongoing. In order to make calls and send texts while in Airplane mode, we would suggest confirming wifi calling is turned on. There's a bit more information about this here, https://comca.st/3q59gEI.

If you continue to have trouble after attempting these steps, please let us know.

@ComcastCaitlin After going into airplane mode I turn wifi back on. After that I can go to google chrome and browse the web and receive emails, that proves I have a wifi connection but can not send text.