I ran a quick test with code very similar to yours and it worked for me. Here's my test code:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no"/>
<meta name="apple-mobile-web-app-capable" content="yes" />
<title>Map</title>
<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/2.8/js/dojo/dijit/themes/claro/claro.css">
<style type='text/css'>
body{
padding:0;
margin:0;
}
html,body,#map,#mainView{
height:100%;
}
#navPane{
display:none;
}
</style>
<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=3.0"></script>
<script type='text/javascript'>
dojo.require("esri.map");
dojo.require("esri.tasks.geometry");
dojo.addOnLoad(init);
var map,geometryService;
var placesKey='Google Key';
function init(){
esri.config.defaults.io.proxyUrl = 'http://localhost/~kell3008/proxy/proxy.php';
geometryService = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
var supportsOrientationChange = "onorientationchange" in window, orientationEvent = supportsOrientationChange ? "orientationchange" : "resize";
window.addEventListener(orientationEvent, function() {
orientationChanged();
}, false);
map = new esri.Map('map');
//find location
if(navigator.geolocation){
navigator.geolocation.getCurrentPosition(function(location){
var pt = esri.geometry.geographicToWebMercator(new esri.geometry.Point(location.coords.longitude, location.coords.latitude));
var symbol = new esri.symbol.PictureMarkerSymbol({"angle":0,"xoffset":0,"yoffset":0,"type":"esriPMS","url":"http://static.arcgis.com/images/Symbols/Shapes/BlueStarLargeB.png","contentType":"image/png","width":18,"height":18});
graphic = new esri.Graphic(pt, symbol);
map.graphics.add(graphic);
map.centerAndZoom(pt,14);
var loc = location.coords.latitude + ',' + location.coords.longitude;
findPlaces(loc);
//display accuracy
var params = new esri.tasks.BufferParameters();
params.geometries = [pt];
params.distances = [location.coords.accuracy]; //accuracy in meters
params.unit = esri.tasks.GeometryService.UNIT_METER;
params.outSpatialReference = map.spatialReference;
geometryService.buffer(params,function(results){
if(results.length > 0){
var symbol = new esri.symbol.SimpleFillSymbol();
symbol.setColor(new dojo.Color([100,100,100,0.25]));
symbol.setOutline(null);
var graphic = new esri.Graphic(results[0],symbol);
map.graphics.add(graphic);
}
});
},function(positionerror){
switch(positionerror.code){
case 0:
console.log("Unknown error occurred");
break;
case 1:
console.log("Permission denied");
break;
case 2:
console.log("Unable to find current location");
break;
case 3:
console.log("Location request timed out");
break;
}
});
}
var basemap = new esri.layers.ArcGISTiledMapServiceLayer('http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer');
map.addLayer(basemap);
}
function orientationChanged(){
if(map){
map.reposition();
map.resize();
}
}
function findPlaces(location){
var placesUrl = 'https://maps.googleapis.com/maps/api/place/search/json';
var params ={
location:location,
sensor:false,
radius:5000,
types:'book_store',
key:placesKey,
}
var places = esri.request({
url:placesUrl,
content:params,
handleAs:'json'
});
places.then(requestSucceeded,requestFailed);
}
function requestSucceeded(response){
dojo.forEach(response.results,function(result){
var pt = esri.geometry.geographicToWebMercator(new esri.geometry.Point(result.geometry.location.lng, result.geometry.location.lat,new esri.SpatialReference(4326)));
console.log(result);
var attr = {'name':result.name,'address':result.vicinity};
var symbol = new esri.symbol.PictureMarkerSymbol({"angle":0,"xoffset":0,"yoffset":0,"type":"esriPMS","url":result.icon,"contentType":"image/png","width":16,"height":16});
var infoTemplate = new esri.InfoTemplate('Books',"${*}");
graphic = new esri.Graphic(pt, symbol,attr,infoTemplate);
map.graphics.add(graphic);
})
}
function requestFailed(response){
console.log(response);
}
</script>
</head>
<body class='claro'>
<div id='mainView' dojoType='dojox.mobile.View' selected='true'>
<div id='map'></div>
</div>
</body>
</html>
