Iphone SE a1662 LTE band in India

A1662 is a model and not model number.

The first letter in the model number represents the source of the device. There are four known possible choices:

• "F": refurbished unit
• "M": retail unit
• "N": replacement unit
• "P": personalized (engraved) unit

Typical Model number looks like this e.g. MC922LL/A (LL indicates bought in USA)

Cellular and Wireless

• Model A1662*
  • LTE (Bands 1, 2, 3, 4, 5, 8, 12, 13, 17, 18, 19, 20, 25, 26, 29)
  • CDMA EV‑DO Rev. A (800, 1700/2100, 1900, 2100 MHz)
  • UMTS/HSPA+/DC‑HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
  • GSM/EDGE (850, 900, 1800, 1900 MHz)
• Model A1723*
  • LTE (Bands 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28)
  • TD‑LTE (Bands 38, 39, 40, 41)
  • TD‑SCDMA 1900 (F), 2000 (A)
  • CDMA EV‑DO Rev. A (800, 1700/2100, 1900, 2100 MHz)
  • UMTS/HSPA+/DC‑HSDPA (850, 900, 1700/2100, 1900, 2100 MHz)
  • GSM/EDGE (850, 900, 1800, 1900 MHz)

If you tap on the A1662 in that model number field, the actually model number will appear. Take the time to post that actual model number and you can get a little more help.