Mom wanting her daughter's friends to leave their cell phones and iPads at home

Recently my daughter wanted to have a sleepover with a few friends. Both of the friends she wanted to have over had iPhones, iPads and cell phones. We dont feel our daughter has any need for this as of yet. We have, in the past, found that these friends bring these devices and then text other kids instead of engaging with friends often leaving each other out. I'm not sure if its ok to ask kids to leave their cell phones and iPads at home or check them at the door. I have spoken to their parents to ask how they feel, but they dont seem to think there is any reason for concern. Please help, I need some advice.