diff --git a/remix-lib/src/execution/txExecution.js b/remix-lib/src/execution/txExecution.js
index 7c2bd24c11..71bf676fb6 100644
--- a/remix-lib/src/execution/txExecution.js
+++ b/remix-lib/src/execution/txExecution.js
@@ -43,7 +43,7 @@ module.exports = {
     * @param {Function} finalCallback    - last callback.
     */
   callFunction: function (from, to, data, value, gasLimit, funAbi, txRunner, callbacks, finalCallback) {
-    var tx = { from: from, to: to, data: data, useCall: false, value: value, gasLimit: gasLimit }
+    var tx = { from: from, to: to, data: data, useCall: funAbi.constant, value: value, gasLimit: gasLimit }
     txRunner.rawRun(tx, callbacks.confirmationCb, callbacks.gasEstimationForceSend, callbacks.promptCb, (error, txResult) => {
       // see universaldapp.js line 660 => 700 to check possible values of txResult (error case)
       finalCallback(error, txResult)
diff --git a/remix-lib/src/execution/txRunner.js b/remix-lib/src/execution/txRunner.js
index d0f3fdf3d9..3f660d32d3 100644
--- a/remix-lib/src/execution/txRunner.js
+++ b/remix-lib/src/execution/txRunner.js
@@ -133,6 +133,9 @@ class TxRunner {
           ++self.blockNumber
           this.runBlockInVm(tx, block, callback)
         } else {
+          console.dir("============")
+          console.dir("========= useCall")
+          console.dir("============")
           executionContext.vm().stateManager.checkpoint(() => {
             this.runBlockInVm(tx, block, (err, result) => {
               executionContext.vm().stateManager.revert(() => {
diff --git a/remix-simulator/src/methods/transactions.js b/remix-simulator/src/methods/transactions.js
index a942dcdfdf..41cc5be22a 100644
--- a/remix-simulator/src/methods/transactions.js
+++ b/remix-simulator/src/methods/transactions.js
@@ -50,8 +50,8 @@ Transactions.prototype.eth_getTransactionReceipt = function (payload, cb) {
       'cumulativeGasUsed': Web3.utils.toHex(receipt.gas),
       'contractAddress': receipt.contractAddress,
       'logs': receipt.logs,
-      // 'status': receipt.status
-      'status': "0x01"
+      'status': receipt.status
+      // 'status': "0x01"
     }
 
     if (r.blockNumber === '0x') {
@@ -83,6 +83,9 @@ Transactions.prototype.eth_call = function (payload, cb) {
   if (payload.params && payload.params.length > 0 && payload.params[0].from) {
     payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
   }
+  if (payload.params && payload.params.length > 0 && payload.params[0].to) {
+    payload.params[0].to = ethJSUtil.toChecksumAddress(payload.params[0].to)
+  }
   processTx(this.accounts, payload, true, cb)
 }
 
diff --git a/remix-simulator/src/methods/txProcess.js b/remix-simulator/src/methods/txProcess.js
index 83b5e9a1d6..69fdc0bd8b 100644
--- a/remix-simulator/src/methods/txProcess.js
+++ b/remix-simulator/src/methods/txProcess.js
@@ -9,6 +9,9 @@ function runCall (payload, from, to, data, value, gasLimit, txRunner, callbacks,
       return callback(err)
     }
 
+    console.dir(result.result.vm)
+    console.dir(result.result.vm.error)
+    console.dir(result.result)
     let toReturn = '0x' + result.result.vm.return.toString('hex')
     if (toReturn === '0x') {
       toReturn = '0x0'
@@ -16,7 +19,7 @@ function runCall (payload, from, to, data, value, gasLimit, txRunner, callbacks,
     return callback(null, toReturn)
   }
 
-  TxExecution.callFunction(from, to, data, value, gasLimit, null, txRunner, callbacks, finalCallback, true)
+  TxExecution.callFunction(from, to, data, value, gasLimit, {constant: true}, txRunner, callbacks, finalCallback, true)
 }
 
 function runTx (payload, from, to, data, value, gasLimit, txRunner, callbacks, callback) {
@@ -27,7 +30,7 @@ function runTx (payload, from, to, data, value, gasLimit, txRunner, callbacks, c
     callback(null, result.transactionHash)
   }
 
-  TxExecution.callFunction(from, to, data, value, gasLimit, null, txRunner, callbacks, finalCallback, false)
+  TxExecution.callFunction(from, to, data, value, gasLimit, {constant: false}, txRunner, callbacks, finalCallback, false)
 }
 
 function createContract (payload, from, data, value, gasLimit, txRunner, callbacks, callback) {