Thanks for the idea stoo - got it working :D <php>
$avatar = IPSMember::buildAvatar( $memberData );
$mem = $this->DB->buildAndFetch( array( 'select' => 'field_18', 'from' => 'pfields_content', 'where' => 'member_id= ' . $memberData['member_id'] ) );
</php>
<div class='left def'>{$avatar}</div><div class='mapka'><h3><a href='{parse url="showuser={$memberData['member_id']}" template="showuser" seotitle="{$memberData['members_seo_name']}" base="public"}' title='{$this->lang->words['view_profile']}'>{$memberData['members_display_name']}</a><span class='ieHide'>{parse template="user_popup" group="global" params="$memberData['member_id'], $memberData['members_seo_name']"}</span></h3><p>{$memberData['prefix']}{$memberData['g_title']}{$memberData['suffix']}</p><p>Tel. {$mem['field_18']}</p><if test="($this->memberData['member_id'] && $member['member_id'] == $this->memberData['member_id']) || $this->memberData['g_is_supmod'] == 1"><p class='remMarker'><a href='{parse url="module=membermap&action=removeMarker&do={$memberData['member_id']}" base="publicWithApp" template="removeMarker" seotitle="false"}' title='{$this->lang->words['modRemoveMarker']}'>{parse replacement="rep_down"} {$this->lang->words['modRemoveMarker']}</a></p></if></div><br clear='all'/>
where field_18 could be any field from extra profile field content
(thanks to DawPi from forum.invisionize.pl)
Once again - it's a great mod - keep it up!!