I can not send SMS - General Questions and Answers

I have a new problem. )) Htc Ozone. Verizon. Telephone use by another operator. In CDMA mode, do not send SMS, wrote-Error Class Permanent Cause Code SMS Trm.D Delivery Failed. Prompt please, what and where to fix For correct sending SMS !!!!!

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SMS sending problem

Suddenly when trying to send a test message I get the following error message:
"Message Undeliverable. You must first subscribe to the text messaging feature through your service provider"
I've always been able to send and receive. I just returned from overseas and my TP reconfigures itself for my network , but I don't see what changes that might have made to stop SMS sending.
Any ideas what setting I need to fix?
Is this a network issue or a device issue.

Help All my incoming SMS are Unknown Sender

Does any one have an Idea, as too, why all my incoming SMS are Unknown Sender, when in fact they are not unknown, they are in my contact list. Please note if I click on where is says "Unknown sender" which is a link by the way, I can then see who is sending the message. But the message comes in as Unknown Sender always.
Please help, I would like to correct this on my Phone Palm Treo Pro.
Please comment if you also have the same problem or if you think you have a solution to this problem. Thanks
UPDATE: I notice today, that the real problem is that my outgoing SMS (Text Messages ) are being register as Incoming ( they stay in my INBOX ) and incoming enters as Unknown Sender.
I think, if some one knows how to work with Registries, you can help me, or if you can recommend a full Option program for SMS/MMS.

[Q] Sending SMS around the world. [to USA from UK]

Should sending an SMS message to another phone, in another country, always work?
I have a friend in the USA, and one in Uruaguay and neither of them receive my SMS messages.
I use the number they give me, and I am sure the format is correct.
Texting (sms) USA has never worked for me on whatever phone I use.
Can anyone give me any pointers please?
I thought the general setup for the US was a standard 10 digit number. If you have the entry as +112345676890 it should work, where the first '1' is the USA country code.

Call back number on sms

Does anyone know how to remove the call back number on every single sms message I receive? Even if the person has it turned off on their phone it still shows up on mine when they send me a message. I would just use another messaging app because that fixes the problem but then I can send mms messages. I'm on a local carrier and can't find the settings to put in to fix this either. Any help is appreciated thanks.
*can't send mms I meant to say.

Unable to send SMS but able to receive

I have a REDMI 4 with Vodafone 4G sim.The only problem is that whenever I send a sms sending is failed.However receiving sms is ok.I checked the smsc number and it is correct.I request guidance from this forum to sfind a solution for this annoying problem.Thank you

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