diff --git a/server/notification-providers/serwersms.js b/server/notification-providers/serwersms.js
index f7c8644af..5987153d5 100644
--- a/server/notification-providers/serwersms.js
+++ b/server/notification-providers/serwersms.js
@@ -17,14 +17,24 @@ class SerwerSMS extends NotificationProvider {
                     "Content-Type": "application/json",
                 }
             };
+
             let data = {
                 "username": notification.serwersmsUsername,
                 "password": notification.serwersmsPassword,
-                "phone": notification.serwersmsPhoneNumber,
-                "text": msg.replace(/[^\x00-\x7F]/g, ""),
+                "text": msg.replace(/[^\x00-\x7F]/g, ""), // SerwerSMS may not support special characters without UTF-8 encoding
                 "sender": notification.serwersmsSenderName,
             };
 
+            // **CHANGED:** Now uses notification.destinationType and notification.destinationValue directly
+            if (notification.destinationType === "group") {
+                data.group_id = notification.destinationValue;
+            } else if (notification.destinationType === "phone") {
+                data.phone = notification.destinationValue;
+            } else {
+                // Throws an error if recipient type is not defined or invalid
+                throw new Error("SerwerSMS: Recipient type (phone number or group ID) must be defined.");
+            }
+
             let resp = await axios.post(url, data, config);
 
             if (!resp.data.success) {
@@ -32,8 +42,7 @@ class SerwerSMS extends NotificationProvider {
                     let error = `SerwerSMS.pl API returned error code ${resp.data.error.code} (${resp.data.error.type}) with error message: ${resp.data.error.message}`;
                     this.throwGeneralAxiosError(error);
                 } else {
-                    let error = "SerwerSMS.pl API returned an unexpected response";
-                    this.throwGeneralAxiosError(error);
+                    this.throwGeneralAxiosError("SerwerSMS.pl API returned an unexpected response");
                 }
             }
 
diff --git a/src/components/notifications/SerwerSMS.vue b/src/components/notifications/SerwerSMS.vue
index 32a0ff7a8..7a156926e 100644
--- a/src/components/notifications/SerwerSMS.vue
+++ b/src/components/notifications/SerwerSMS.vue
@@ -3,14 +3,34 @@
         <label for="serwersms-username" class="form-label">{{ $t('serwersmsAPIUser') }}</label>
         <input id="serwersms-username" v-model="$parent.notification.serwersmsUsername" type="text" class="form-control" required>
     </div>
+
     <div class="mb-3">
         <label for="serwersms-key" class="form-label">{{ $t('serwersmsAPIPassword') }}</label>
         <HiddenInput id="serwersms-key" v-model="$parent.notification.serwersmsPassword" :required="true" autocomplete="new-password"></HiddenInput>
     </div>
+
     <div class="mb-3">
-        <label for="serwersms-phone-number" class="form-label">{{ $t("serwersmsPhoneNumber") }}</label>
-        <input id="serwersms-phone-number" v-model="$parent.notification.serwersmsPhoneNumber" type="text" class="form-control" required>
+        <label class="form-label">{{ $t("serwersmsDestinationType") }}</label><br>
+        <div class="form-check form-check-inline">
+            <input id="dest-phone" v-model="$parent.notification.destinationType" type="radio" class="form-check-input" value="phone" required>
+            <label class="form-check-label" for="dest-phone">{{ $t("serwersmsPhoneNumber") }}</label>
+        </div>
+
+        <div class="form-check form-check-inline">
+            <input id="dest-group" v-model="$parent.notification.destinationType" type="radio" class="form-check-input" value="group">
+            <label class="form-check-label" for="dest-group">{{ $t("serwersmsGroupId") }}</label>
+        </div>
     </div>
+
+    <div class="mb-3">
+        <label for="serwersms-destination-value" class="form-label">
+            {{ $t($parent.notification.destinationType === 'group' ? 'serwersmsGroupId' : 'serwersmsPhoneNumber') }}
+        </label>
+        <input id="serwersms-destination-value" v-model="$parent.notification.destinationValue" type="text" class="form-control" required>
+        <div v-if="$parent.notification.destinationType === 'group'" class="form-text">{{ $t("serwersmsGroupIdHelp") }}</div>
+        <div v-else class="form-text">{{ $t("serwersmsPhoneHelp") }}</div>
+    </div>
+
     <div class="mb-3">
         <label for="serwersms-sender-name" class="form-label">{{ $t("serwersmsSenderName") }}</label>
         <input id="serwersms-sender-name" v-model="$parent.notification.serwersmsSenderName" type="text" minlength="3" maxlength="11" class="form-control">
diff --git a/src/lang/en.json b/src/lang/en.json
index b6449371b..306354b4f 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -756,10 +756,14 @@
     "alertaApiKey": "API Key",
     "alertaAlertState": "Alert State",
     "alertaRecoverState": "Recover State",
-    "serwersmsAPIUser": "API Username (incl. webapi_ prefix)",
-    "serwersmsAPIPassword": "API Password",
+    "serwersmsAPIUser": "API username (including the webapi_ prefix)",
+    "serwersmsAPIPassword": "API password",
     "serwersmsPhoneNumber": "Phone number",
-    "serwersmsSenderName": "SMS Sender Name (registered via customer portal)",
+    "serwersmsSenderName": "SMS sender name (registered via the client portal)",
+    "serwersmsGroupId": "Group ID",
+    "serwersmsGroupIdHelp": "Enter the GROUP ID (group_id from the SerwerSMS panel)",
+    "serwersmsDestinationType": "Recipient type",
+    "serwersmsPhoneHelp": "Enter the phone number, e.g., +48123456789.",
     "smseagleTo": "Phone number(s)",
     "smseagleGroup": "Phonebook group name(s)",
     "smseagleContact": "Phonebook contact name(s)",