isValidNumber returning false for MVNO telecom company prefix for SA

let nbNumber = try? NBPhoneNumberUtil.sharedInstance().parse("+966575670234", defaultRegion: "SA") let isValid = NBPhoneNumberUtil.sharedInstance().isValidNumber(nbNumber)

MVNO prefix (Virgin and Lebara): "7"

Actual: isValid is false Expected: isValid is true

libPhoneNumber-iOS version 1.0.4