I lost my sim card tray is there a way to put the sim card in w/o it?

Hi,

You really need to have the tray because this holds the SIM card in the correct position in relation to the SIM card reader so that the phone will be able to connect to the network.

Just inserting it would create problems so please don’t do it, e.g. how to remove it if necessary and how to ensure that it is in the correct position so that it works and that it stays there and doesn’t move and possibly create electrical problems in the phone

Search online for Galaxy A10 SIM card tray to find suppliers (example only to show cost of part)