The SMS integration has been removed in 2025.12… Anyone having a solution to use a local modem (Huawei E3531 attached to my Proxmox Node) to continue to send and receive SMS ? I am looking for a local solution not using internet connection. Thanks.
You can send a notification to a local device (other than your router) and have that send the SMS.
I have a wall dashboard running on an Android tablet, which has a SIM card. HA sends a notification to the tablet, which is also running the Llamalab Automate app. The app converts the notification into a SMS message and sends it. You can probably do the same thing with Tasker.
If your Proxmox node (or a VM or container) is running software like smstools, you should be able to simply use a custom script in ha to create a sms through there.
Can you already send and receive sms messages through the modem?
@tmjpugh: US and Canada only…
He’s also looking for a local solution, so this won’t work.
Yes It was working with the SMS integration from HA but this has been discontinued in the last release… Sometimes I have problems to understand the strategy because for me SMS is 100% part of a house automation (if you want to receive notification when Internet is down at your house for example)… I will have a look at SMSTOOLS… or go back to the gammu interface I was using a couple of years ago… but this is still a home made tool and I want to stop maintaining local tools… Thank you for your response.
Finally I decided to go back to the previous home made solution as I was sure it was working before… It was still installed on my two HA instances but had to recheck/modify the process and shell scripts (fortunately automations where not affected)… I spent 3 hours on this issue 
but now SMS are back… Yes ! Thank you all for your input 