/// <summary>
/// Info on succesfully imported contacts.
/// </summary>
/// <param name="phoneNumber">Phone number</param>
/// <param name="firstName">First name the user assigned to himself</param>
/// <param name="lastName">Last name the user assigned to himself</param>
/// <returns></returns>
public async Task <bool> ImportContactByPhoneNumberAsync(string phoneNumber, string firstName, string lastName)
{
string normalizedPhoneNumber = phoneNumber.TrimStart('+');
await ConnectAsync();
ContactsImportedContactsConstructor importedConacts = await _client.ImportContactByPhoneNumber(normalizedPhoneNumber, firstName, lastName);
return(importedConacts != null && importedConacts.importedContacts.Count == 1);
}