Can previous phone get blocked?

[YeahWhatevs]

Hello, the lovely people of this forum.
Long story short -
My sister paid off her iPhone 7 completely and got a new phone from the same network provider (24 month contract).
It’s been two months now and she’s having payment issues already (yes, I’m trying to help her with payments).
She sold her iPhone 7 already (the one she had before). The question is - if she cannot pay for her new phone, can her old one get blacklisted for that? Or just the new one?
Or will they just stop calls and SMS on the SIM?

Cheers, guys!

[adamtemp64]

Only the handset on the current contract as it is tied to the imei of the new handset @YeahWhatevs

[Bambino · Accepted solution]

@YeahWhatevs Only the SIM will be blocked if payments aren't made, but you should try to sort this as quickly as possible, as non-payments have serious ramifications for her credit rating, which affects more than just not paying O2.

[YeahWhatevs]

@adamtemp64 I hope so, thanks!

@Bambino We are trying to sort this out. She really doesn’t want to lose her new phone, but she just recently has left her job so she’s trying to find a new one

[Bambino]

@YeahWhatevs I'm glad to hear you're trying to sort this out. If she's having trouble making her payments, she really should inform customer service. They might be able to provide her with a payment plan, but it would probably involve her phone usage being curtailed. That would still be a better option than being cut off completely, having a negative mark on her credit rating, and then also having to pay a reconnection fee. If you haven't called customer service yet, here are the details: https://www.o2.co.uk/contactus

Good luck. I hope you can get this resolved.

[YeahWhatevs]

@Bambino Huh... This is all new to us. She’ll ring Customer Services ASAP.
Massive thank you for your help!