protected void validatePhone(T item) throws WebServerBadRequestException {
		if (item instanceof ModelScheduledItem) {
			String phone = ((ModelScheduledItem) item).getPhone();
			if (phone == null || phone.isEmpty()) {
				((ModelScheduledItem) item).setPhone(null);
				return;
			} else if (!phone.matches("0\\d\\d\\d\\d\\d\\d\\d\\d\\d")) {
				throw new WebServerBadRequestException("Phone number is not valid: " + phone + " (Format: 0xxxxxxxxx)");
			}
		}
	}