This is a short and comprehensive guide to understand exactly which model you have on your iPhone or iPad. This is very helpful since we always want to come to you prepared with exactly the appropriate spare part.
First check the backside of you iPhone or iPad like in the image below
Then look in the following list to identify your exact model.
iPhone XS Max A1921, A2101
iPhone XS A1920, A2097
iPhone XR A1984
iPhone X A1865, A1901
iPhone X. A1865
iPhone 8 A1863, A1905
iPhone 8 Plus. A1864, A1897
iPhone 7 A1660, A1778
iPhone 7 Plus. A1661, A1784, A1785
iPhone 6s A1633, A1688, A1700
iPhone 6s Plus A1634, A1687, A1689
iPhone 6 A1549, A1586, A1589
iPhone 6 Plus A1522, A1524, A1593
iPhone 5s. A1453, A1457, A1518, A1533
iPhone 5se. A1723, A1662, A1724
iPhone 5c A1456, A1507, A1516, A1529
iPhone 5. A1428, A1429, A1442
iPad Air. A1474, A1475, A1476
iPad Air 2. A1566, A1567
iPad 5. A1822, A1823
iPad 6. A1893, A1954
iPad 2. A1395, A1396, A1397
iPad 3. A1416, A1430, A1403
iPad 4. A1458, A1459, A1460