diff --git a/apps/mobile/app/(app)/call.tsx b/apps/mobile/app/(app)/call.tsx
new file mode 100644
index 0000000..525f4e9
--- /dev/null
+++ b/apps/mobile/app/(app)/call.tsx
@@ -0,0 +1,165 @@
+import { useRouter } from 'expo-router';
+import { useEffect, useMemo, useState } from 'react';
+import { Pressable, StyleSheet, Text, View } from 'react-native';
+
+import { Avatar } from '../../components/Avatar';
+import { useCall } from '../../lib/callContext';
+import { colors } from '../../theme/colors';
+
+export default function CallScreen() {
+  const router = useRouter();
+  const { state, toggleMute, toggleSpeaker, endCall } = useCall();
+  const [seconds, setSeconds] = useState(0);
+
+  useEffect(() => {
+    if (state.kind !== 'connected') return;
+    setSeconds(0);
+    const id = setInterval(() => setSeconds((s) => s + 1), 1000);
+    return () => clearInterval(id);
+  }, [state.kind]);
+
+  useEffect(() => {
+    if (state.kind === 'idle') {
+      router.back();
+    }
+  }, [state.kind, router]);
+
+  const duration = useMemo(() => {
+    const m = Math.floor(seconds / 60);
+    const s = seconds % 60;
+    return [m, s].map((n) => String(n).padStart(2, '0')).join(':');
+  }, [seconds]);
+
+  if (state.kind === 'idle' || state.kind === 'ended') {
+    return (
+      <View style={styles.container}>
+        <Text style={styles.title}>Anruf beendet</Text>
+      </View>
+    );
+  }
+
+  if (state.kind === 'incoming') {
+    return null;
+  }
+
+  const connecting = state.kind === 'connecting' || state.kind === 'outgoing';
+  const participants = state.kind === 'connected' ? state.participants : [];
+  const muted = state.kind === 'connected' ? state.muted : false;
+  const speakerOn = state.kind === 'connected' ? state.speakerOn : false;
+
+  return (
+    <View style={styles.container}>
+      <View style={styles.header}>
+        <Text style={styles.title}>{connecting ? 'Verbinde ...' : 'Anruf lauft'}</Text>
+        {state.kind === 'connected' && <Text style={styles.duration}>{duration}</Text>}
+      </View>
+
+      <View style={styles.participantList}>
+        {participants.length === 0 && (
+          <Text style={styles.empty}>Warten auf Teilnehmer ...</Text>
+        )}
+        {participants.map((p) => (
+          <View key={p.identity} style={styles.participantRow}>
+            <Avatar name={p.name} size={48} />
+            <View style={styles.participantText}>
+              <Text style={styles.participantName}>{p.name}</Text>
+              <Text style={[styles.participantStatus, p.speaking && styles.participantSpeaking]}>
+                {p.speaking ? 'Spricht ...' : 'Stumm'}
+              </Text>
+            </View>
+          </View>
+        ))}
+      </View>
+
+      <View style={styles.toolbar}>
+        <ToolbarButton
+          label={muted ? 'Stumm' : 'Mikro'}
+          active={muted}
+          onPress={() => {
+            void toggleMute();
+          }}
+        />
+        <ToolbarButton
+          label={speakerOn ? 'Lautsprecher' : 'Hoerer'}
+          active={speakerOn}
+          onPress={() => {
+            void toggleSpeaker();
+          }}
+        />
+        <Pressable
+          style={styles.hangup}
+          onPress={() => {
+            void endCall();
+          }}
+        >
+          <Text style={styles.hangupText}>Auflegen</Text>
+        </Pressable>
+      </View>
+    </View>
+  );
+}
+
+function ToolbarButton({
+  label,
+  active,
+  onPress,
+}: {
+  label: string;
+  active: boolean;
+  onPress: () => void;
+}) {
+  return (
+    <Pressable
+      onPress={onPress}
+      style={[styles.toolbarButton, active && styles.toolbarButtonActive]}
+    >
+      <Text style={[styles.toolbarButtonText, active && styles.toolbarButtonTextActive]}>
+        {label}
+      </Text>
+    </Pressable>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, backgroundColor: colors.bg, padding: 24 },
+  header: { alignItems: 'center', marginTop: 24, gap: 6 },
+  title: { color: colors.text, fontSize: 24, fontWeight: '700' },
+  duration: { color: colors.textMuted, fontSize: 16, fontVariant: ['tabular-nums'] },
+  participantList: { flex: 1, marginTop: 24, gap: 12 },
+  empty: { color: colors.textMuted, textAlign: 'center', marginTop: 32 },
+  participantRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 12,
+    backgroundColor: colors.surface,
+    padding: 12,
+    borderRadius: 12,
+    borderColor: colors.border,
+    borderWidth: 1,
+  },
+  participantText: { flex: 1 },
+  participantName: { color: colors.text, fontSize: 16, fontWeight: '600' },
+  participantStatus: { color: colors.textMuted, fontSize: 12, marginTop: 2 },
+  participantSpeaking: { color: colors.success, fontWeight: '700' },
+  toolbar: { flexDirection: 'row', gap: 12, paddingBottom: 16 },
+  toolbarButton: {
+    flex: 1,
+    paddingVertical: 14,
+    borderRadius: 14,
+    backgroundColor: colors.surface,
+    borderColor: colors.border,
+    borderWidth: 1,
+    alignItems: 'center',
+  },
+  toolbarButtonActive: { backgroundColor: colors.accentMuted, borderColor: colors.accent },
+  toolbarButtonText: { color: colors.text, fontWeight: '600' },
+  toolbarButtonTextActive: { color: colors.accent },
+  hangup: {
+    flex: 1,
+    paddingVertical: 14,
+    borderRadius: 14,
+    backgroundColor: colors.danger,
+    alignItems: 'center',
+  },
+  hangupText: { color: colors.text, fontWeight: '700' },
+});