Now OnePlus support 5G in Oman, all versions, EU, China, Indian version, is band n78.
At the moment, there is a setting with local operators, now you will not see the 5g sign as it will be after the next update, which will be in August 2020.
*Attention* : CN version, Official Global ROM, Mulit Language, Support OTA Update, support band n78.
You can use your phone and internet without any problems 4G+ works, only after the update you will see 5g.
2G: GSM: 850/900/1800/1900 MHz; CDMA: BC0
3G: WCDMA: Band 1/2/4/5/8/9/19
4G: FDD LTE: Band 1/2/3/4/5/7/8/12/17/18/19/20/26;
TDD LTE: Band 34/38/39/40/41
MIMO：LTE：B1, 3, 41 ; NR: n1, n3, n41, n78, n79
*Note* : Actual network and frequency band usage depends on local operator deployment.
Before buying, please make sure it will be suitable for you to use.
*We do not accept returning OnePlus phones if your network not support 5G*
After the update, which is expected in July 2020, all mobile communications operators in the UAE will support 5g.