diff --git a/app/src/main/java/im/angry/openeuicc/core/TelephonyManagerApduInterface.kt b/app/src/main/java/im/angry/openeuicc/core/TelephonyManagerApduInterface.kt
index f06e317..b3b2089 100644
--- a/app/src/main/java/im/angry/openeuicc/core/TelephonyManagerApduInterface.kt
+++ b/app/src/main/java/im/angry/openeuicc/core/TelephonyManagerApduInterface.kt
@@ -69,12 +69,8 @@ class TelephonyManagerApduInterface(
 
     override val atr: ByteArray?
         get() = try {
-            tm.iccGetAtr(slotIndex)?.decodeHex()
-        } catch (e: NoSuchMethodException) {
-            try {
-                tm.getAtrUsingSlotId(slotIndex)
-            } catch (e: Exception) {
-                null
-            }
+            tm.iccGetATR(port.card.physicalSlotIndex)
+        } catch (e: Exception) {
+            null
         }
 }
\ No newline at end of file
diff --git a/libs/hidden-apis-shim/src/main/java/im/angry/openeuicc/util/TelephonyManagerHiddenApi.kt b/libs/hidden-apis-shim/src/main/java/im/angry/openeuicc/util/TelephonyManagerHiddenApi.kt
index 0d5d463..288742b 100644
--- a/libs/hidden-apis-shim/src/main/java/im/angry/openeuicc/util/TelephonyManagerHiddenApi.kt
+++ b/libs/hidden-apis-shim/src/main/java/im/angry/openeuicc/util/TelephonyManagerHiddenApi.kt
@@ -64,18 +64,12 @@ private val getITelephony: Method by lazy {
     }
 }
 
-fun TelephonyManager.getAtrUsingSlotId(slotId: Int): ByteArray? {
+fun TelephonyManager.iccGetATR(slotId: Int): ByteArray? {
     val telephony = getITelephony.invoke(this)
     val getAtrUsingSlotId = telephony.javaClass.getMethod("getAtrUsingSlotId", Int::class.java)
     return getAtrUsingSlotId.invoke(telephony, slotId) as ByteArray?
 }
 
-fun TelephonyManager.iccGetAtr(slotId: Int): String? {
-    val telephony = getITelephony.invoke(this)
-    val iccGetAtr = telephony.javaClass.getMethod("iccGetAtr", Int::class.java)
-    return iccGetAtr.invoke(telephony, slotId) as String?
-}
-
 fun TelephonyManager.iccOpenLogicalChannelBySlot(
     slotId: Int, appletId: String?, p2: Int
 ): IccOpenLogicalChannelResponse =
@@ -113,15 +107,10 @@ fun TelephonyManager.iccTransmitApduLogicalChannelByPort(
 
 var TelephonyManager.simSlotMapping: Collection<UiccSlotMapping>
     get() = getSimSlotMapping.invoke(this) as Collection<UiccSlotMapping>
-    set(new) {
-        setSimSlotMapping.invoke(this, new)
-    }
+    set(new) { setSimSlotMapping.invoke(this, new) }
 
 private val requestEmbeddedSubscriptionInfoListRefresh: Method by lazy {
-    SubscriptionManager::class.java.getMethod(
-        "requestEmbeddedSubscriptionInfoListRefresh",
-        Int::class.java
-    )
+    SubscriptionManager::class.java.getMethod("requestEmbeddedSubscriptionInfoListRefresh", Int::class.java)
 }
 
 fun SubscriptionManager.requestEmbeddedSubscriptionInfoListRefresh(cardId: Int) {