<form #f="ngForm" [formGroup]="phoneForm">
<ngx-intl-tel-input
[cssClass]="'custom'"
[preferredCountries]="[CountryISO.UnitedStates, CountryISO.UnitedKingdom]"
[enableAutoCountrySelect]="false"
[enablePlaceholder]="true"
[searchCountryFlag]="true"
[searchCountryField]="[SearchCountryField.Iso2, SearchCountryField.Name]"
[selectFirstCountry]="false"
[selectedCountryISO]="CountryISO.India"
[maxLength]="15"
[phoneValidation]="true"
[inputId]="my-input-id"
name="phone"
formControlName="phone"
></ngx-intl-tel-input>
</form>