What is the service where you can send SMS, is it possible for a fee?

Question

SMS

Hello. I need to send only 1 message to a couple of numbers 1-5 times a month. The sender number must be a number, not text. Is there a service like this? Note that you do not need to accept, but you need to send. Whether there will be a substitution or just a random number - it doesn't matter to me, the main thing is that the sender is a number. I am testing my authorization, I need for this. Of the free ones, not one works, and of the paid ones, only mass mailings, and absolutely everyone I found sends from all sorts - "super taxi", etc., and not from a number. Well, the extreme option I have is just to buy a SIM card, but there are all sorts of subscribers, I forget to renew, cut down, sometimes I don’t use it for a long time, and it takes a long time to issue it, I have to go, quickly, as needed - you won’t issue it, but, for example, it’s night, but I I just need to send sms.

Answer 1

As a variant. Buy a SIM card and set a per-minute rate. There will be no subscriber

Answer 2

I can advise you to do it yourself on the basis of LILYGO TTGO T-Call; you don't have to solder.
Pros:
a) you will definitely not be banned for such a number of SMS
b) you are the owner of the SIM card and the number will definitely not change
c) cheap and when you send at least one SMS per month the number will not be lost
Cons:
You need to make a firmware that is either a) periodically asks the server what to send b) keeps a TCP connection to the server c) is itself a server and accepts commands via TCP.
I use these modules to receive SMS. By the way, you can’t send in bulk - see the contract.

Answer 3

https://smsc.ru/

Answer 4

Operators are now struggling with mass SMS with federal numbers. Therefore, large services cannot provide this reliably. If SIM-banks are used, then they are quickly banned. Sending via SS7 past the interconnect now works very poorly, only some gray schemes remain, in which the delivery level is already below 50%.
The legal way is to rent a name from all operators. It's expensive, yes. But operators, under the pretext of fighting spam, are forcing this. Or you will have to agree to common names for specific services (yes, I already read that you do not want this).
And the last way, which is conditionally illegal, but with 10 SMS per month, hardly anyone will notice: plug a GSM modem with a SIM card into your computer / server and send it through it.
But in general, if this is all for testing, then the actual sending of SMS is generally not clear why it is needed. I generated the code in the application - it appeared in the logs - entered the code from the logs in the client interface.