I am not able to send or receive messages on iphone. I get "not delivered" then "try again" but no option to "send as text". Worked fine until two days ago. MMS and SMS are on.
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what iPhone (iPhone 4,5,6?) and what iOS version (9.3, 10.1...) are you using? Where are you located? (US/UK/...)– palloxCommented Feb 15, 2017 at 11:15
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3 Answers
Persistent Not delivered error usually is related to connectivity issues, so make sure you're connected to the internet, then double check your iCloud credentials by going to Settings and verify that you're logged in properly into your Apple ID account (you may also consider signing out and signing in again).
TLDR
Under Cellular > Cellular Data Options > Voice & Data try switching from LTE to 4G. If that does not help see steps which I took below before my SMS started to work.
I have US Mobile carrier and this article helped me solve this issue for my carrier:
(Archived)
First, I updated my APN settings under Cellular > Cellular Data Network to these values:
https://www.apnsettings.org/us/us-mobile/ (Archived)
Name : US Mobile
APN : pwg
Proxy : Not Set
Port : Not Set
Username : Not Set
Password : Not Set
Server : Not Set
MMSC : http://pwg.mmsmvno.com/mms/wapenc
MMS Proxy : Not Set
MMS Port : Not Set
MCC : 310
MNC : 260
Authentication Type : Not Set
APN type : default,supl,mms
APN protocol: Ipv4
APN roaming protocol: Ipv4
Enable/disable APN: APN Enabled
Bearer: Unspecified
MVNO type : None
MVNO Value : Not set
I don't know if this was necessary to solve my problem but on it's own updating APN did not solve my problem.
However, after I went to Cellular > Cellular Data Options > Voice & Data and switch from LTE to 4G I started to be able to send SMS messages to non iPhones.
Perhaps similar steps can be helpful in resolving people's problem on other carriers.
NOTE: That first linked article states:
For sim cards ordered before 9th June 2021, please make sure Voice and Data are set to 4G and VoLTE OFF. This should resolve the issue temporarily. Please get in touch with support so that we can send a replacement sim card for you.
So, apparently, it could be that some people need updated SIM card to be fix their problem.
If your carrier allows it, you can view your APN settings in one of the following locations: Settings > Cellular > Cellular Data Options > Cellular Network. Settings > Mobile Data > Mobile Data Options > Mobile Data Network
