tel:0123456789
is not a beautiful output for a link field. It should be possible to overwrite it.
For example like this: $page->link()->toLink(['html' => 'Link name'])
Here’s my recommendation:/kirby/config/methods.php line: 221
$value = $attr['html'] ?? $field->value;
unset($attr['html']);
return Html::a($href, $value, $attr ?? []);