How can I text from my PC?

You would need to know the email address of the phone. For T-Mobile its the 10 digit number@tmobile.net. You would need to look up yours for your carrier.

@att.net   = AT&T

@Vtext.com  = Verizon     

All you need is the 10-digit number before each of those.

The only way I know of for that to work is Air message over web (my wife has an iPhone and I was trying to find a way to replicate the "messages for web" feature on my Android), BUT you have to have a Mac computer that's running the server software first. I never found anything that was seamless between iPhone and Windows without relying on a Mac.

@gr8gonzo, that would be nice if you can airmessage to a Windows machine. I was looking at that as well, but I don't think he has a MAC.

That's my guess, as well. Apple does seem to sometimes be responsive to user demand for features that are outside its ecosystem (e.g. itunes on windows and iCloud for windows and so on) but it's hit or miss. Perhaps they'll have this feature natively in the future without the need for a Mac. (shrug)

just first clarify if you mean SMS text message from any mobile phone (not only iPhones which use iMessaging) to be received and sent from your Windows 11 computer?

Yes, I want to be able to send and receive text messages on my Wndows computer.   I have used Dell Mobile Connect, but it fails to connect to my iPhone repeatedly.   Even restarting the PC and the phone only works occasionally.

M$ says you can do it from their phone app (I have not tried it) 

See: https://support.microsoft.com/en-us/topic/send-and-receive-text-messages-from-your-pc-43189e43-8121-35f6-7930-db095bf938a4

I have tried the Email method (as mentioned above)...

1. Open your Mail App.
2. Click on New Mail.
3. In the To: field enter the target phone number @ the code of YOUR provider.
4. Write the message as you would a normal email.
5. When you’re done, hit Send.

Here are the message codes of some popular providers you can use:

(Just to be clear use your own phone's provider)
    Alltel: @message.alltel.com (or @mms.alltelwireless.com for picture messages)
    AT&T: @text.att.net
    Sprint: @messaging.sprintpcs.com
    T-Mobile: @tmomail.net
    Verizon: @vtext.com (or @vzwpix.com for photos and video)

If you have a Mac, then you can just sign in to icloud and get imessages on both the Mac and the iphone.  There isn't any analogous software for Windows 11

You could use 3rd part messaging apps, such as whatsapp, line, kakaotalk, telegram, etc..., but your contacts would have to use the same app.

The Email method should work from MAC or Linux too.

MS Phone Link only works with Android phones.   I have an iPhone.   Somebody must know how to do this.   

Dell Mobile Connect is being discontinued.   No surprise there!

I just told you you can email the phone number @ your provider works from any email account.

@fred - that isn't what the OP is asking for.

Not sure if you're open to simply doing screen mirroring / casting, but that would let you control your iPhone from your Windows PC and access it's features including SMS.

Two apps come to mind - AirDroid (originally an Android app but they've expanded to iOS) and TeamViewer. 

Is there any substitute for Dell Mobile Connect?   When I can get it to work, it allows for both sending and receiving texts from any phone.

Here are a few other apps that allow texting from the computer.

Does any of these apps allow receiving texts on the computer, as well as sending them?

No, none of the items in Edward's list are relevant here. Most of them are voip providers which means it's a completely different line from your iPhone. They can send and receive sms on a desktop but it's not your iPhone's texts.

The ones that aren't voip providers can't do the job or are only for Android.

I had included AirDroid for screen mirroring but it turns out that it doesn't allow remote control on iOS.

I think your best bet (and also free) is TeamViewer - to remote control your iPhone from your desktop. 

Yes, I use Verizon.   I will check to see if that works.   Thank you.

please be aware that a general solution to your requirement is not available simply because SMS-based text messaging is totally managed and operated by your mobile provider. in other words, any third party including mobile providers and software vendors can not access the private info. otherwise, people of today won't rely on SMS for receiving MFA verification codes.

you are lucky using Verizon which provides online access to the SMS messages for their users.