diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..7305366
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,26 @@
+on:
+  release:
+    types: [published]
+permissions:
+  contents: read
+  packages: write
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/github-script@v4
+        with:
+          script: core.setOutput('version', context.ref.replace(/refs\/tags\/v?/, ''))
+        id: version
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+      - uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            ghcr.io/${{ github.repository }}:${{ steps.version.outputs.version }}
+            ghcr.io/${{ github.repository }}:latest
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..ff62f8d
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,26 @@
+on: pull_request
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: docker/build-push-action@v2
+        id: image
+      - run: >-
+          docker run ${{ steps.image.outputs.digest }}
+          --message="$MESSAGE"
+          --recipient=10123456789
+          --sender=19876543210
+          --date=1970-12-31T23:59:59
+          --reference=255
+          --status=INBOUND_NOT_READ |
+          diff - <(printf "$RESULT")
+        env:
+          MESSAGE: |
+            Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+            sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+            Ut enim ad minim veniam, quis nostrud exercitation ullamco
+            laboris nisi ut aliquip ex ea commodo consequat.
+          RESULT: |
+            0307910121436587F9400B919178563412F0000007211332959500A0050003FF0201986F79B90D4AC3E7F53688FC66BFE5A0799A0E0AB7CB741668FC76CFCB637A995E9783C2E4343C3D1FA7DD6750999DA6B314F33219447E83CAE9FABCFD2683E8E536FC2D07A5DDE334394DAEBBE9A03A1DC40E8BDFF232A84C0791DFECB7BC0C6A87CFEE3028CC4EC7EB6197A24A0795DDE936284C06B5D3EE741B642FBBD3E1360B14AFA7E7
+            0307910121436587F9400B919178563412F000000721133295950056050003FF020240EEF79C2EAF9341657C593E4ED3C3F4F4DB0DAAB3D9E1F6F8AD6087C56F797A0E72A7E769509D0E0AB3D3F17A1A0E2AE341E53068FC6EB7DFE43768FC76CFCBF17A98EE5200
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..e98aae4
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,6 @@
+FROM python:2.7-alpine
+WORKDIR /opt/montlhery
+COPY requirements.txt .
+COPY montlhery.py montlhery
+RUN pip install --requirement requirements.txt
+ENTRYPOINT ["python", "montlhery"]
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..00301a3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,34 @@
+# Montlhéry
+
+Tool to generate concatenated SIM card SMS records in the EF<sub>SMS</sub> format. Named after the telegraph of Montlhéry from [Le Comte de Monte-Cristo](https://fr.wikisource.org/wiki/Le_Comte_de_Monte-Cristo/Chapitre_61).
+
+## Example
+
+Message `HELLO` with `INBOUND_NOT_READ` status, sent from `+1 987 654 3210` to `+1 012 345 6789` with reference `255` and date/time 1970-12-31 23:59:59.
+
+```console
+$ montlhery \
+> --message=HELLO \
+> --recipient=10123456789 \
+> --sender=19876543210 \
+> --date=1970-12-31T23:59:59 \
+> --reference=255 \
+> --status=INBOUND_NOT_READ
+0307910121436587F9400B919178563412F00000072113329595000C050003FF0101904526F309
+```
+
+## Installation
+
+This project only supports Python 2 [(obsolete)](https://www.python.org/doc/sunset-python-2) because of the [`smspdu`](https://pypi.org/project/smspdu) package. Use the provided container images to avoid [XKCD 1987](https://xkcd.com/1987).
+
+```console
+$ docker run --rm ghcr.io/0x2b3bfa0/montlhery --help
+```
+
+## References
+
+* [3GPP TS 31.102 V17.4.0 (2021-12) 4.2.25](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1803)
+* [3GPP TS 24.011 V17.0.0 (2020-12) 8.2.5.2](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1017)
+* [3GPP TS 23.040 V17.1.0 (2021-06) 9.2.2.1](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=747) 
+* [3GPP TS 23.040 V17.1.0 (2021-06) 9.2.3.24.1](https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=747) 
+* [UNDERSTANDING SMS: Practitioner's Basics](https://mobileforensics.files.wordpress.com/2007/06/understanding_sms.pdf)
diff --git a/montlhery.py b/montlhery.py
new file mode 100644
index 0000000..fb0bca0
--- /dev/null
+++ b/montlhery.py
@@ -0,0 +1,47 @@
+import time
+import click
+from smspdu.pdu import SMS_GENERIC, SMS_DELIVER
+
+
+STATUSES = {
+    "INBOUND_READ": 0b001,
+    "INBOUND_NOT_READ": 0b011,
+    "OUTBOUND_SENT": 0b101,
+    "OUTBOUND_NOT_SENT": 0b111,
+}
+
+
+@click.command()
+@click.option('--message', type=str, required=True)
+@click.option('--recipient', type=str, required=True)
+@click.option('--sender', type=str, required=True)
+@click.option('--date', type=click.DateTime(), default=None)
+@click.option('--reference', type=int, default=0)
+@click.option('--limit', type=int, default=153)
+@click.option('--status', type=click.Choice(STATUSES.keys()))
+def montlhery(sender, recipient, message, date, reference, limit, status):
+    """
+    Create SMS records in the EF.SMS SIM card format.
+    """
+    length, type, data = SMS_GENERIC.determineAddress(recipient)
+    recipient = (chr(length - 4) + chr(type) + data).encode("hex")
+
+    chunks = range(0, len(message), limit)
+    for chunk, offset in enumerate(chunks, start=1):
+        header = (0, (reference, len(chunks), chunk))
+        data = message[offset:offset+limit]
+
+        deliver = SMS_DELIVER.create(
+            sender=sender,
+            recipient=None,
+            user_data=data,
+            datestamp=time.mktime(date.timetuple()),
+            user_data_headers=[header]
+        ).toPDU()
+
+        print("%02X" % STATUSES[status] + recipient.upper() + deliver)
+
+
+if __name__ == '__main__':
+    montlhery()
+
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..691ce9b
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+click==7.1.2
+smspdu==1.0