Hi roame,
welcome to the Apple (user-to-user) Community.
Re: "Iphone text messages now green"
wondering if you have the latest iOS version on your iPhone:
(About iOS 16 Updates - Apple Support says iOS 16.4.1 is the latest.)
or
You might want to try restarting your iPhone, which often restores normality: Restart your iPhone - Apple Support
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Re: "my messages still send as green.
The delivered indicator also doesnt show.
Anybody know how to help?"
Apple support's online article may help:
What is the difference between iMessage and SMS/MMS? – Apple Support
Generally, Messages uses wi-fi to send (blue-bubble) messages to and from Apple users, (and to indicate delivery, if set to show).
If wi-fi is not available messages go by cellular data, if it is turned on.
So you may need to check your wi-fi is on and working ok.
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
or
If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support
Else:
If you are using other wi-fi apps while messaging, the messages may need to use cellular instead of the wi-fi which is already in use elsewhere (ie: depending on the strength of your wi-fi signal which may (or may not) be quite adequate for both apps).
Seems SMS & MMS to Android users use cellular data (green message bubbles): and charges from your provider may or may not apply.
Apple support have an article online to help with turning cellular on or off: How to: Use cellular data on your iPhone or iPad - Apple Support
Eg: article above also says:
"If activated, Wi-Fi Assist automatically switches to use cellular data when Wi-Fi connectivity is poor. Wi-Fi Assist is on by default."
More Info: About Wi-Fi Assist – Apple Support
Eg: says:
"Wi-Fi Assist only works when you have apps running in the foreground and doesn't activate with background downloading of content".
More info. / support / if needed:
Messages Support website:
Messages for iPhone, iPad, Apple Watch and Mac — Official Apple Support
All the best :-)