diff --git a/src/api/api.go b/src/api/api.go
index 1bbdf57..ac154bc 100644
--- a/src/api/api.go
+++ b/src/api/api.go
@@ -53,6 +53,10 @@ type RegisterNumberRequest struct {
 	Captcha  string `json:"captcha"`
 }
 
+type UnregisterNumberRequest struct {
+	DeleteAccount bool `json:"delete_account" example:"false"`
+}
+
 type VerifyNumberSettings struct {
 	Pin string `json:"pin"`
 }
@@ -177,6 +181,41 @@ func (a *Api) RegisterNumber(c *gin.Context) {
 	c.Writer.WriteHeader(201)
 }
 
+// @Summary Unregister a phone number.
+// @Tags Devices
+// @Description Disables push support for this device. **WARNING:** If *delete_account* is set to *true*, the account will be deleted from the Signal Server. This cannot be undone without loss.
+// @Accept  json
+// @Produce  json
+// @Success 204
+// @Failure 400 {object} Error
+// @Param number path string true "Registered Phone Number"
+// @Param data body UnregisterNumberRequest false "Additional Settings"
+// @Router /v1/unregister/{number} [post]
+func (a *Api) UnregisterNumber(c *gin.Context) {
+	number := c.Param("number")
+
+	deleteAccount := false
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(c.Request.Body)
+	if buf.String() != "" {
+		var req UnregisterNumberRequest
+		err := json.Unmarshal(buf.Bytes(), &req)
+		if err != nil {
+			log.Error("Couldn't unregister number: ", err.Error())
+			c.JSON(400, Error{Msg: "Couldn't process request - invalid request."})
+			return
+		}
+		deleteAccount = req.DeleteAccount
+	}
+
+	err := a.signalClient.UnregisterNumber(number, deleteAccount)
+	if err != nil {
+		c.JSON(400, gin.H{"error": err.Error()})
+		return
+	}
+	c.Writer.WriteHeader(204)
+}
+
 // @Summary Verify a registered phone number.
 // @Tags Devices
 // @Description Verify a registered phone number with the signal network.
diff --git a/src/client/client.go b/src/client/client.go
index 9ea1996..45a8f0f 100644
--- a/src/client/client.go
+++ b/src/client/client.go
@@ -492,6 +492,20 @@ func (s *SignalClient) RegisterNumber(number string, useVoice bool, captcha stri
 	return err
 }
 
+func (s *SignalClient) UnregisterNumber(number string, deleteAccount bool) error {
+	if s.signalCliMode == JsonRpc {
+		return errors.New("This functionality is only available in normal/native mode!")
+	}
+
+	command := []string{"--config", s.signalCliConfig, "-a", number, "unregister"}
+	if deleteAccount {
+		command = append(command, "--delete-account")
+	}
+
+	_, err := runSignalCli(true, command, "", s.signalCliMode)
+	return err
+}
+
 func (s *SignalClient) VerifyRegisteredNumber(number string, token string, pin string) error {
 	if s.signalCliMode == JsonRpc {
 		return errors.New(endpointNotSupportedInJsonRpcMode)
diff --git a/src/main.go b/src/main.go
index 31b1303..45d1a81 100644
--- a/src/main.go
+++ b/src/main.go
@@ -152,6 +152,11 @@ func main() {
 			register.POST(":number/verify/:token", api.VerifyRegisteredNumber)
 		}
 
+		unregister := v1.Group("unregister")
+		{
+			unregister.POST(":number", api.UnregisterNumber)
+		}
+
 		sendV1 := v1.Group("/send")
 		{
 			sendV1.POST("", api.Send)