Dsd is 7. Overnight contact has recently resumed with her and dss who is 6 after their mum stopping contact, moving without informing us, making false allegations etc. Dp said if the dc want to speak to their mum they can, but so far they haven't mentioned her when with us. His ex has now said dsd will be bringing an iPhone with her so she can call/text/whats app etc her mum whenever she likes. Dp has said he'll put the phone away but dsd is often instructed of her 'rights' before contact (I.e. If you tell me off I will be going home as mummy says you must take me if I want to go) so I think she'll want to keep it with her.
Nevermind the fact it has internet access which I'm not happy with dsc or our dc having unsupervised, I think it's very intrusive on our household not to mention disruptive to dps parenting time and undermining of his authority. Aibu to say to dp he needs to tell his ex that the phone isn't welcome at our house rather than make excuses to dsd and ultimately give in and let her retrieve it from wherever he's put it?