diff --git a/ios/Fula.mm b/ios/Fula.mm
index 4376fa3..cf9d39c 100644
--- a/ios/Fula.mm
+++ b/ios/Fula.mm
@@ -125,12 +125,12 @@ @interface RCT_EXTERN_MODULE(FulaModule, NSObject)
 RCT_EXTERN_METHOD(listPools:(RCTPromiseResolveBlock)resolve
                   withRejecter:(RCTPromiseRejectBlock)reject)
 
-RCT_EXTERN_METHOD(joinPool: (NSNumber *)poolID
+RCT_EXTERN_METHOD(joinPool: (NSString *)poolID
                   withResolver:(RCTPromiseResolveBlock)resolve
                   withRejecter:(RCTPromiseRejectBlock)reject)
 
 
-RCT_EXTERN_METHOD(cancelPoolJoin:(NSNumber *)poolID
+RCT_EXTERN_METHOD(cancelPoolJoin:(NSString *)poolID
                   withResolver:(RCTPromiseResolveBlock)resolve
                   withRejecter:(RCTPromiseRejectBlock)reject)
 
@@ -145,7 +145,7 @@ @interface RCT_EXTERN_MODULE(FulaModule, NSObject)
                   withResolver:(RCTPromiseResolveBlock)resolve
                   withRejecter:(RCTPromiseRejectBlock)reject)
 
-RCT_EXTERN_METHOD(leavePool:(NSNumber *)poolID
+RCT_EXTERN_METHOD(leavePool:(NSString *)poolID
                   withResolver:(RCTPromiseResolveBlock)resolve
                   withRejecter:(RCTPromiseRejectBlock)reject)
 
diff --git a/ios/Fula.swift b/ios/Fula.swift
index 180794d..7790b28 100644
--- a/ios/Fula.swift
+++ b/ios/Fula.swift
@@ -1256,12 +1256,14 @@ class FulaModule: NSObject {
       }
   }
 
-
   @objc(joinPool:withResolver:withRejecter:)
-  func joinPool(poolID: Int, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+  func joinPool(poolID: String, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
       print("ReactNative", "joinPool: poolID = ", poolID)
       do {
-          let result = try fula!.joinPool(poolID: poolID)
+          guard let poolIdInt = Int(poolID) else {
+              throw NSError(domain: "Invalid poolID", code: 0, userInfo: nil)
+          }
+          let result = try fula!.joinPool(poolID: poolIdInt)
           let resultString = String(data: result, encoding: .utf8)
           resolve(resultString)
       } catch let error {
@@ -1269,11 +1271,13 @@ class FulaModule: NSObject {
       }
   }
 
-
   @objc(cancelPoolJoin:withResolver:withRejecter:)
-  func cancelPoolJoin(poolID: Int, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+  func cancelPoolJoin(poolID: String, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
       do {
-          let result = try fula!.cancelPoolJoin(poolID: poolID)
+          guard let poolIdInt = Int(poolID) else {
+              throw NSError(domain: "Invalid poolID", code: 0, userInfo: nil)
+          }
+          let result = try fula!.cancelPoolJoin(poolID: poolIdInt)
           let resultString = String(data: result, encoding: .utf8)
           resolve(resultString)
       } catch let error {
@@ -1281,12 +1285,14 @@ class FulaModule: NSObject {
       }
   }
 
-
   @objc(leavePool:withResolver:withRejecter:)
-  func leavePool(poolID: Int, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
+  func leavePool(poolID: String, resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
       print("ReactNative", "leavePool: poolID = ", poolID)
       do {
-          let result = try fula!.leavePool(poolID: poolID)
+          guard let poolIdInt = Int(poolID) else {
+              throw NSError(domain: "Invalid poolID", code: 0, userInfo: nil)
+          }
+          let result = try fula!.leavePool(poolID: poolIdInt)
           let resultString = String(data: result, encoding: .utf8)
           resolve(resultString)
       } catch let error {
@@ -1294,6 +1300,7 @@ class FulaModule: NSObject {
       }
   }
 
+
   @objc(eraseBlData:withRejecter:)
   func eraseBlData(resolve: @escaping RCTPromiseResolveBlock, reject: @escaping RCTPromiseRejectBlock) {
       do {