$scope.sendValues = function () {
    MyService.function1($scope.value1, $scope.value2);

    for(var i = 0; i < $scope.arr.length; i++) {
        $scope.value3 = $(".input" + i).val();
        MyService.function2($scope.value3);
    }
};

var tempID = 0;

var function1 = function (value1, value2) {
    return $http({
        method: 'POST',
        url: "someUrl",
        data: {
            valeu1: value1,
            value2: value2
        }
    }).success(function (response) {
        tempID = response.data.id;
    });
};

var function2 = function (value3) {
    return $http({
        method: 'POST',
        url: "anotherURL",
        data: {
            value3: value3,
            tempID: tempID
        }
   });
};