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Update:

I have been doing a lot of Device / Server <--> MQTT <--> Node-RED <--> Device / Server / Mobile Phone recently.

In that work, I trying using a number of SMS gateway services; and...

And here is a basic code example for using the arduino for an SMS project (https://www.arduino.cc/en/Tutorial/GSMExamplesSendSMS):

https://www.arduino.cc/en/Tutorial/GSMExamplesSendSMS




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Or this kit, also on AliExpress (https://www.aliexpress.com/item/32865477089.html):

Or maybe this kit, (https://www.aliexpress.com/item/32953399908.html?spm=a2g0o.detail.0.0.4d8582fcn1cmUD&gps-id=pcDetailFavMayLike) also on AliExpress?
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How about this as a arduino project with an sms board?



See for example, from AliExpress...

You are describing an email to SMS gateway service provided by some carriers.

These types of email to SMS gateways are becoming more and more rare these days, generally speaking.

Check other sites for an SMS gateway service which services your country.

You will need to use someone's SMS gateway service. For example, here is one with an sh based SMS API (using curl):

https://developer.nexmo.com/messaging/sms/overview

But there are so many...