--- a/dom/icc/tests/marionette/test_icc_contact_add.js
+++ b/dom/icc/tests/marionette/test_icc_contact_add.js
@@ -25,16 +25,24 @@ var TEST_ADD_DATA = [{
     // a contact with anr but without email.
     name: ["add5"],
     tel: [{value: "01234567890123456789"}, {value: "123456"}, {value: "123"}],
   }, {
     // a contact with email and anr.
     name: ["add6"],
     tel: [{value: "01234567890123456789"}, {value: "123456"}, {value: "123"}],
     email:[{value: "test@mozilla.com"}],
+  }, {
+    // a contact without number.
+    name: ["add7"],
+    tel: [{value: ""}],
+  }, {
+    // a contact without name.
+    name: [""],
+    tel: [{value: "0987654321"}],
   }];
 
 function testAddContact(aIcc, aType, aMozContact, aPin2) {
   log("testAddContact: type=" + aType + ", pin2=" + aPin2);
   let contact = new mozContact(aMozContact);
 
   return aIcc.updateContact(aType, contact, aPin2)
     .then((aResult) => {

--- a/dom/icc/tests/marionette/test_icc_contact_update.js
+++ b/dom/icc/tests/marionette/test_icc_contact_update.js
@@ -20,17 +20,17 @@ const TEST_UPDATE_DATA = [{
       // We don't support extension chain now.
       number: "9876543210987654321099887766554433221100"}
   }, {
     id: 3,
     data: {
       name: ["Fire 火"],
       tel: [{value: ""}]},
     expect: {
-      number: null}
+      number: ""}
   }, {
     id: 5,
     data: {
       name: ["Contact001"],
       tel: [{value: "9988776655443322110098765432109876543210"}]},
     expect: {
       number: "9988776655443322110098765432109876543210"}
   }, {
@@ -47,22 +47,18 @@ function testUpdateContact(aIcc, aType, 
       ", mozContact=" + JSON.stringify(aMozContact) +
       ", expect=" + aExpect.number + ", pin2=" + aPin2);
 
   let contact = new mozContact(aMozContact);
   contact.id = aIcc.iccInfo.iccid + aContactId;
 
   return aIcc.updateContact(aType, contact, aPin2)
     .then((aResult) => {
-      if (aExpect.number === null) {
-        is(aResult.tel, null);
-      } else {
-        is(aResult.tel[0].value, aExpect.number);
-        ok(aResult.tel.length == 1);
-      }
+      is(aResult.tel[0].value, aExpect.number);
+      ok(aResult.tel.length == 1);
       // We only support SIM in emulator, so we don't have anr and email field.
       ok(!aResult.email);
       is(contact.id, aIcc.iccInfo.iccid + aContactId);
     }, (aError) => {
       if (aType === "fdn" && aPin2 === undefined) {
         ok(aError.name === "SimPin2",
            "expected error when pin2 is not provided");
       } else {
@@ -96,21 +92,17 @@ function testUpdateContacts(aIcc, aType,
   promise = promise.then(() => aIcc.readContacts(aType))
   .then((aResult) => {
     for (let i = 0; i < TEST_UPDATE_DATA.length; i++) {
       let expectedResult = TEST_UPDATE_DATA[i];
       let contact = aResult[expectedResult.id - 1];
 
       is(contact.name[0], expectedResult.data.name[0]);
       is(contact.id, aIcc.iccInfo.iccid + expectedResult.id);
-      if (expectedResult.expect.number === null) {
-        is(contact.tel, null);
-      } else {
-        is(contact.tel[0].value, expectedResult.expect.number);
-      }
+      is(contact.tel[0].value, expectedResult.expect.number);
     }
     return revertContacts(aIcc, aCacheContacts, aType, aPin2);
   });
 
   return promise;
 }
 
 // Start tests

--- a/dom/system/gonk/tests/test_ril_worker_icc_ICCPDUHelper.js
+++ b/dom/system/gonk/tests/test_ril_worker_icc_ICCPDUHelper.js
@@ -362,17 +362,17 @@ add_test(function test_write_alpha_ident
   let context = worker.ContextPool._contexts[0];
   let helper = context.GsmPDUHelper;
   let iccHelper = context.ICCPDUHelper;
   // Length of trailing 0xff.
   let ffLen = 2;
 
   // Removal
   let writenAlphaId = iccHelper.writeAlphaIdentifier(10, null);
-  equal(writenAlphaId, null);
+  equal(writenAlphaId, "");
   equal(iccHelper.readAlphaIdentifier(10), "");
 
   // GSM 8 bit
   let str = "Mozilla";
   writenAlphaId = iccHelper.writeAlphaIdentifier(str.length + ffLen, str);
   equal(writenAlphaId , str);
   equal(iccHelper.readAlphaIdentifier(str.length + ffLen), str);
 
@@ -396,17 +396,17 @@ add_test(function test_write_alpha_ident
   writenAlphaId = iccHelper.writeAlphaIdentifier(4, str);
   helper.writeHexOctet(0xff); // dummy octet.
   equal(writenAlphaId , str.substring(0, 1));
   equal(iccHelper.readAlphaIdentifier(5), str.substring(0, 1));
 
   // Write 0 octet.
   writenAlphaId = iccHelper.writeAlphaIdentifier(0, "1");
   helper.writeHexOctet(0xff); // dummy octet.
-  equal(writenAlphaId, null);
+  equal(writenAlphaId, "");
   equal(iccHelper.readAlphaIdentifier(1), "");
 
   run_next_test();
 });
 
 /**
  * Verify ICCPDUHelper.readAlphaIdDiallingNumber
  */
@@ -485,18 +485,18 @@ add_test(function test_write_alpha_id_di
   equal(writtenContact.alphaId, contactR.alphaId);
   equal(writtenContact.number, contactR.number);
   equal(0xff, contactR.extRecordNumber);
 
   // Write a null contact (Removal).
   writtenContact = helper.writeAlphaIdDiallingNumber(recordSize);
   contactR = helper.readAlphaIdDiallingNumber(recordSize);
   equal(contactR, null);
-  equal(writtenContact.alphaId, null);
-  equal(writtenContact.number, null);
+  equal(writtenContact.alphaId, "");
+  equal(writtenContact.number, "");
 
   // Write a longer alphaId/dialling number
   // Dialling Number : Maximum 20 digits(10 octets).
   // Alpha Identifier: 32(recordSize) - 14 (10 octets for Dialling Number, 1
   //                   octet for TON/NPI, 1 for number length octet, and 2 for
   //                   Ext) = Maximum 18 octets.
   let longContact = {
     alphaId: "AAAAAAAAABBBBBBBBBCCCCCCCCC",