Thats in /skin1/customer/top_menu.tpl, where it says:
Code:
<tr>
<td height=35 align=center class=HeadText>
{$lng.lbl_phone_1_title}: {$config.Company.company_phone}{$lng.lbl_phone_2_title}: {$config.Company.company_phone_2}</td>
</tr>
What it does here is pickup variables from the languages table, but you could just take it out if you dont want to display it.