[nirajd]

I had the same issue when switching to a Nexus 5.

https://appleid.apple.com Try going here and removing the phone number from the "Phone Numbers" section. I still have friends who try to message me and their iOS assumes I'm using iMessage. The "retry as SMS" feature is the only method that works.

[stevenelliottjr]

Also make sure to tell them "Send as SMS" is enabled on their iMessage settings. This will automatically try to re-send it as a text without manual intervention.

[mkreef]

My wife just switched from an iPhone to a Note 3 and this concerned me, but I was surprised her cell number is not listed with her apple id.