in a file called App_Themes\Default\gridview.skin
Code:
<asp:GridView runat="server" SkinID="NPTResults_m" AllowPaging="True" AllowSorting="True" PageSize="50" AutoGenerateColumns="False"
CellPadding="1" CellSpacing="0">
<HeaderStyle CssClass="FieldNameFont" ForeColor="#111111" HorizontalAlign="Left" VerticalAlign="Top" BorderStyle="Solid" BorderWidth="0px" BorderColor="#c0c0c0"/>
<RowStyle CssClass="FieldValueFont" BackColor="#ffffff" VerticalAlign="Top" BorderStyle="Solid" BorderWidth="0px" BorderColor="#cacaca" />
<AlternatingRowStyle CssClass="FieldValueFont" BackColor="#ebebf3" VerticalAlign="Top" BorderStyle="Solid" BorderWidth="0px" BorderColor="#cacaca" />
<PagerSettings Position="TopAndBottom" Mode="NumericFirstLast" />
<PagerStyle BackColor="#ffffff" HorizontalAlign="Center" CssClass="FieldNameFont" />
<EmptyDataRowStyle CssClass="FieldValueFont" />
</asp:GridView>
mostley it makes the gridviews more compact for mobile devices but other things may chnage as well.
cheers
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