1- Go to Settings and then select Mobile Data.
2- In Voice & Data, to use the 3rd Generation, select 3G option and to 4G network, select LTE option.
3- Then go back to Settings menu, select Carrier option.
4- If you can’t find the RighTel network in the “Automatic” mode, turn off Automatic option. Use from existing options, RighTel or IRN 20.
Note: If you are using an International Roaming Service, select the preferred destination operator from the displayed operators’ list by selecting “Search Network”.