My daughter recently switched to Ting Wireless so that she could have an iPhone. Her phone has been activated on Ting for four days now. Our other family members and myself (all still on Republic, all still with various Moto X generations) can receive text messages from her, but she cannot receive texts from us. SMS messaging is enabled on all devices.
You may want to refer to this document if you have not seen it.
You may also want to try the Android Messages - Android Apps on Google Play which has officially replaced the Google Messenger