Which read-SMS-online services will receive verification codes from Digits?

Question

Background

I use Twitter's Digits SDK in an app for sign-in, essentially allowing the Users to sign-in quickly use an existing (previously verified by a web app) mobile numbers. This has worked great during internal testing and everyone likes the feature.

Digits SDK

This is part of Twitter's Fabric SDK. It provides a view controller that appears, allows a User to type in a phone number, verify it with a 6-digit code sent via SMS, and it returns auth tokens, etc.

Problem

In order for Apple to review my app, I have to provide a phone number where an Apple employee can receive an SMS [from the Digits verification service] so to be able to authenticate and test my app.

Problem is, I've already tried a number of "Read SMS online" services, but none are receiving the codes from Twitter / Digits. Without a solution, I'm don't have a way for the Apple review team to get past the first menu of my app.

Any ideas? Thank you.