Is there a webpage where you input a phone number and it replies with
the cellular provider.

I think someone here once said there was, but I may be mixing things up.
I'm finally convinced that some people are more likely or quicker to see
a text than play voicemail and I like that I can just send an email to a
cellphone and it turns, like a caterpiller, into a text.

In comp.mobile.android, on Sat, 30 Sep 2023 16:29:44 -0400, micky
<NONONOmisc07@fmguy.com> wrote:

>Is there a webpage where you input a phone number and it replies with
>the cellular provider.
>
>I think someone here once said there was, but I may be mixing things up.
>I'm finally convinced that some people are more likely or quicker to see
>a text than play voicemail and I like that I can just send an email to a
>cellphone and it turns, like a caterpiller, into a text.

I had googled and found nothing, but I found better search words:

what is cellular provider for this number

So the answer to my own qustion is:

https://www.ipqualityscore.com/free-carrier-lookup
https://www.hlrlookup.com/
And probably, but I haven't tried it
https://freecarrierlookup.com/

When you know the provider, you can go to this page and find how to
email a text to the phone:

https://www.notepage.net/smtp.htm
For example, to text a Verizon phone, send an eamail to
10digitphonenumber@vtext.com
unfortunately, Verizon has two other choices,
@myvzw.com and @vswpix.com
But 99% of the others only have one.

Even though I use Mint Mobile, the email address is tmobile.
OTOH a friend who uses Cricket has a cricket email address.

No more lifting that heavy phone to make a text when you are already at
your keyboard.