Most of my text messages show (No Subject - Message size 1KB

"Hi Paul,

Check the following 2 things:

a) Is Data enabled?

b)

Select Apps.

Select Settings.

Scroll to and select Mobile networks.

Select Access Point Names.

Select MORE.

Select Reset to default.

Select OK. Your phone will reset to default Internet and MMS settings. Network problems should be solved at this point. Remember to turn off your Wi-Fi before testing. ...

Select ADD.

c) add if it isn't there the new APN settings:

http://apn-settings.com/canada/virgin-mo..."

"Sounds like you're attempting to use MMS vs SMS, MMS may require additional settings. You may want to contact your carrier, if you haven't, and see if there are additional settings in the APN that were not properly configured. The other thing they should be able to do is manual reset your services on their end, we call it reprovisioning.

The link from @avanteguarde provides the APN settings, unless it was changed and they just never updated it.

Good Luck"

Uninstall any 3rd party messaging apps you aren't using, such as Hangouts, Messages (different from the one that came with your phone), etc… Then clean your cache and storage, and reboot your phone. This worked for me!

I have had this problem pop up repeatedly (every month or two). I am not positive but I believe the problem is associated with using Facebook Messenger. Somehow FM either takes over for the phone’s original messaging solution or messes with the settings on which it relies. Many posts suggest the problem is associated with Hangouts app but I do not have that app installed on my phone, so it must be something else. So far, I have been able to solve the problem of No Subject texts by restarting my phone.

I had that problem, as well, in Oct 2020. I had been with Virgin Mobile, which “became” Boost. It appears/appeared to be a Boost network problem as it was upgrading to 5G. My son suggested I switch providers, which I did, and the problem was “solved.” Good luck.