Kitty Forums and Howard Forums.
So far the problem seems to be confined to Android users, there don't seem to be any iPhone users reporting problems with texts. The bug isn't affecting all Android users either, some are able to send texts without error. Only customers using a Page Plus LTE SIM in an LTE capable phone are seeing this bug, non-LTE phones are not effected.
For those who are having the problem, voice and data work, sending and receiving MMS works and receiving SMS works. Only sending SMS fails. Power cycling the phone or even doing a factory reset doesn't seem to help. Page Plus customer support has mot been able to resolve the problem for the effected customers.
There may be a partial workaround, several people say that they can successfully send texts if they disable data in settings. On most recent Android phones data can be disabled by going to Settings >Tethering & networks > Mobile networks and unchecking Data enabled. You can also install a Data Switch Widget to make it easy turn data on and off from the home screen. There are many data switch widgets in the Play Store but the one I linked to is ad-free, doesn't require any special permissions and works with Android 2.3 and later.
Text messaging is such a mission critical feature that I'm sure that Page Plus and Verizon will fix this issue if enough people report it. It you can't send texts on Page Plus LTE, be sure to submit a Support Ticket on the Page Plus site to but the pressure on Page Plus. If you are having the problem and are a Kitty Forums member you can send a DM with your phone number to Kitty who is taking this issue to the top with Page Plus management.
Image by Scared Poet (user Scaredpoet, scaredpoet.com) via Wikimedia Commions Use permitted on CC-BY-SA-2.5