I found the solution you need to move API_AVAILABLE(ios(12.0)) CTCellularPlanProvisioning *plan; API_AVAILABLE(ios(12.0)) CTCellularPlanProvisioningRequest *request; at class level API_AVAILABLE(ios(12.0)) CTCellularPlanProvisioning *plan; API_AVAILABLE(ios(12.0)) CTCellularPlanProvisioningRequest *request; RCT_EXPORT_METHOD(setupEsim:(NSDictionary *)config promiseWithResolver:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject) { if (@available(iOS 12.0, *)) { plan = [[CTCellularPlanProvisioning alloc] init]; if (plan.supportsCellularPlan == NO) { NSError *error = [NSError errorWithDomain:@"react.native.simcardsmanager.handler" code:2 userInfo:nil]; reject(@"1", @"The device doesn't support a cellular plan", error); } else { NSArray *arrayOfComponents = [config[@"confirmationCode"] componentsSeparatedByString:@"$"]; request = [[CTCellularPlanProvisioningRequest alloc] init]; request.OID = config[@"oid"]; request.EID = config[@"eid"]; request.ICCID = config[@"iccid"]; request.address = arrayOfComponents[1]; request.matchingID = arrayOfComponents[2]; request.confirmationCode = config[@"confirmationCode"]; UIBackgroundTaskIdentifier backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{}]; [plan addPlanWith:request completionHandler:^(CTCellularPlanProvisioningAddPlanResult result) { if (result==CTCellularPlanProvisioningAddPlanResultFail){ NSError *error = [NSError errorWithDomain:@"react.native.simcardsmanager.handler" code:1 userInfo:nil]; reject(@"2", @"CTCellularPlanProvisioningAddPlanResultFail - Can't add an Esim subscription", error); }else if (result==CTCellularPlanProvisioningAddPlanResultUnknown){ NSError *error = [NSError errorWithDomain:@"react.native.simcardsmanager.handler" code:1 userInfo:nil]; reject(@"3", @"CTCellularPlanProvisioningAddPlanResultUnknown - Can't setup eSim due to unknown error", error); }else{ //CTCellularPlanProvisioningAddPlanResultSuccess resolve(@(true)); } [[UIApplication sharedApplication] endBackgroundTask:backgroundTaskIdentifier]; }]; } } else { NSError *error = [NSError errorWithDomain:@"react.native.simcardsmanager.handler" code:1 userInfo:nil]; reject(@"0", @"This functionality is not supported before iOS 12.0", error); } }

I have the same issue with IOS 15.4.1!! any update on this