This is a sticker on the inside of the window in a taxi. It says:
NO ADMIN FEE & GST
when you pay with Dash!
Even assuming you like the ampersand in this font (I don’t), the conjunction needed here is ‘or’.
(No admin fee) and (no GST) => No (admin fee or GST)
The sign that says “no food and drinks” is also wrong for the same reason.
However, “Don’t leave your handphone & wallet behind”, assuming we find ‘handphone’ acceptable, sounds fine, since ‘handphone’ and ‘wallet’ can easily be considered a pair of items that would be forgotten together.
I would rewrite that as follows.
Records show that 50% of the items reported lost in taxis are mobile phones and wallets.
On the other hand, I like the ampersand on this half of the sign much better. Even if it is crowding the descender on that letter ‘y’.