Service allows You to check simlock status (locked or unlocked).
Supported are all models, even the latest iPhone 11, 11 Pro, 11 Pro Max.

IMEI check is for free

If you have got an iPhone from a network company, Your iPhone is locked to their network. It means that you can use that network's SIM card and nothing else. If you try to use another SIM card, it won't work on your iPhone.
If status is unlocked, You can use all SIM CARDS from all networks.

Just check it by IMEI status checker