how to show placeholder when countryCodeEditable ?

[romanh24]

Hi, How can I show a placeholder if there are two characters "+1"?

 <PhoneInput
    country={'us'}
    value={this.state.phone}
    onChange={phone => this.setState({ phone })}
    countryCodeEditable={false}
    name={name}
    placeholder={placeholder}
   />

[KonradLinkowski]

Probably related to #355, #464 and #36

[vnt-83]

I'm also interested in how to show a placeholder while entering a number like here: