Apple has released iOS 12.1.2 for iPhone which brings fixes for eSIM activation and cellular connectivity in Turkey.
iOS 12.1.2 includes bug fixes for your iPhone.
For iPhone iOS
12.1.2 (5s GSM): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (5s GSM+CDMA): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (6+): iPhone_5.5_12.1.2_16C101_Restore.ipsw
12.1.2 (6): iPhone_4.7_12.1.2_16C101_Restore.ipsw
12.1.2 (6s): iPhone_4.7_12.1.2_16C101_Restore.ipsw
12.1.2 (6s+): iPhone_5.5_12.1.2_16C101_Restore.ipsw
12.1.2 (SE): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (7 GSM+CDMA): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7+ GSM+CDMA): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7 GSM): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7+ GSM): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 GSM+CDMA): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 Plus GSM+CDMA): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 GSM): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 Plus GSM): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (X GSM+CDMA): iPhone10,3,iPhone10,6_12.1.2_16C101_Restore.ipsw
12.1.2 (X GSM): iPhone10,3,iPhone10,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS): iPhone11,2_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS Max (China)): iPhone11,4,iPhone11,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS Max (Global)): iPhone11,4,iPhone11,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XR): iPhone11,8_12.1.2_16C101_Restore.ipsw
iOS 12.1.2 includes bug fixes for your iPhone.
For iPhone iOS
12.1.2 (5s GSM): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (5s GSM+CDMA): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (6+): iPhone_5.5_12.1.2_16C101_Restore.ipsw
12.1.2 (6): iPhone_4.7_12.1.2_16C101_Restore.ipsw
12.1.2 (6s): iPhone_4.7_12.1.2_16C101_Restore.ipsw
12.1.2 (6s+): iPhone_5.5_12.1.2_16C101_Restore.ipsw
12.1.2 (SE): iPhone_4.0_64bit_12.1.2_16C101_Restore.ipsw
12.1.2 (7 GSM+CDMA): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7+ GSM+CDMA): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7 GSM): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (7+ GSM): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 GSM+CDMA): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 Plus GSM+CDMA): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 GSM): iPhone_4.7_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (8 Plus GSM): iPhone_5.5_P3_12.1.2_16C101_Restore.ipsw
12.1.2 (X GSM+CDMA): iPhone10,3,iPhone10,6_12.1.2_16C101_Restore.ipsw
12.1.2 (X GSM): iPhone10,3,iPhone10,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS): iPhone11,2_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS Max (China)): iPhone11,4,iPhone11,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XS Max (Global)): iPhone11,4,iPhone11,6_12.1.2_16C101_Restore.ipsw
12.1.2 (iPhone XR): iPhone11,8_12.1.2_16C101_Restore.ipsw