I tried this based on another post on this forum, but graphicPoint showed up in Antarctica instead of Florida...
AGSPoint *myPoint = [AGSPoint pointWithX:28.0833 y:-80.6083 spatialReference:[AGSSpatialReference wgs84SpatialReference]];
AGSGeometryEngine *ge = [AGSGeometryEngine defaultGeometryEngine];
AGSGeometry *myPointReprojected = [ge projectGeometry:myPoint toSpatialReference:[AGSSpatialReference webMercatorSpatialReference]];
graphicPoint = (AGSPoint*)myPointReprojected;
graphicAttributes = [NSMutableDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:CustomInfoView], @"type",
@"MacDonald's", @"name",
@"2720 West Broadway, Louisville, KY 40211-1320", @"address",
@"5027787110", @"phone",
@"www.mcdonalds.com", @"url",
nil];
graphicSymbol = [AGSPictureMarkerSymbol pictureMarkerSymbolWithImageNamed:@"McDonalds.png"];
graphic = [AGSGraphic graphicWithGeometry:graphicPoint symbol:graphicSymbol attributes:graphicAttributes infoTemplateDelegate:self];
[self.graphicsLayer addGraphic:graphic];