What happens at their end when they try?
Was it always that way?
Are they on the same network or different networks?
Are they on different types of phone or the same (e.g. all on iPhones, all on Android)?
Are you using an iPhone or Android or something else?
Can they text you?
If you need to contact 48 support about this then see the link in my signature below or email them at support@48months.zendesk.com
