Chosen Solution iPhone SE (A1723) bought from Sprint, will it work global? because apple page states that A1723 is the global unlocked model. https://www.apple.com/iphone/LTE/
The A-number on an Apple product will tell you the hardware version and therefore what networks are supported by that hardware. However the phone could still be SIM-locked. Make sure any phone you buy is unlocked before planning for international travel. The A1723 supports a lot of 4G LTE bands: , LTE2100 (B1)LTE2100 phones support LTE 1900 / 2100MHz (IMT, also refferred as LTE Band 1) band (downlink: 2110 - 2170 MHz, uplink: 1920 - 1980 MHz), LTE1900 (B2)LTE1900 phones support LTE 1900 MHz (PCS , also referred as LTE Band 2) band (downlink: 1930 - 1990 MHz, uplink: 1850 - 1910 MHz), LTE1800 (B3)LTE1800 phones support LTE 1800 MHz (LTE Band 3) band (downlink: 1805 - 1880 MHz, uplink: 1710 - 1785 MHz), LTE1700/2100 (B4)LTE1700/2100 phones support LTE 1700 / 2100 MHz (AWS also referred as LTE Band 4) band (downlink: 2110 - 2155 MHz, uplink: 1710 - 1755 MHz), LTE850 (B5)LTE850 phones support LTE 850 MHz (LTE Band 5) band (downlink: 869 - 894 MHz, uplink: 824 - 849 MHz), LTE2600 (B7)LTE2600 phones support LTE 2600 MHz (LTE Band 7) band (downlink: 2620 - 2690 MHz, uplink: 2500 - 2570 MHz), LTE900 (B8)LTE900 phones support LTE 900 MHz (LTE Band 8) band (downlink: 925 - 960 MHz, uplink: 880 - 915 MHz), LTE700 (B12)LTE700 phones support LTE 700 MHz (LTE Band 12) band (downlink: 728 - 746 MHz, uplink: 698 - 716 MHz), LTE700 (B17)LTE700 phones support LTE 700 MHz (LTE Band 17) band (downlink: 734 - 746 MHz, uplink: 704 - 716 MHz), LTE800 (B18)LTE800 phones support LTE 800 MHz (LTE Band 18) band (downlink: 860 - 875 MHz, uplink: 815 - 830 MHz), LTE800 (B19)LTE800 phones support LTE 800 MHz (LTE Band 19) band (downlink: 875 - 890 MHz, uplink: 830 - 845 MHz), LTE800 (B20)LTE800 phones support LTE 800 MHz (LTE Band 20) band (downlink: 791 - 821 MHz, uplink: 832 - 862 MHz), LTE1900 (B25)LTE1900 phones support LTE 1900 MHz (LTE Band 25) band (downlink: 1930 - 1995 MHz, uplink: 1850 - 1915 MHz), LTE850 (B26)LTE850 phones support LTE 850 MHz (LTE Band 26) band (downlink: 859 - 894 MHz, uplink: 814 - 849 MHz), LTE700 (B28)APT700 phones support LTE 700 MHz (LTE Band 28) band (downlink: 758 - 803 MHz, uplink: 703 - 748 MHz), TD-LTE2600 (B38)TD-LTE 2600 MHz phones support TD-LTE 2600 MHz (LTE Band 38) band (2570 - 2620 MHz), TD-LTE1900 (B39)TD-LTE 1900 MHz phones support Chinese TD-LTE 1900 MHz (LTE Band 39) band (1880 - 1920 MHz), TD-LTE2300 (B40)TD-LTE 2300 phones support Chinese TD-LTE 2300 MHz (LTE Band 40) band (2300 - 2400 MHz), TD-LTE2500 (B41)TD-LTE 2500 MHz phones support TD-LTE 2500 MHz (LTE Band 41) band (2496 - 2690 MHz) bands However this is not every single band in use today or planned....