Purchases of mobile phone + Proximus subscription

I bought a new mobile phone together with a subscription from Proximus. This means that I paid an advance of approximately 390 euros and now pay for my Proximus subscription each month.

The invoice from my mobile phone states in my name, but because my husband went to pick up the phone, the subscription with Proximus is in his name.

How do I record this phone? Just as an advance payment, and does this phone have to be depreciated? I assume not, given the small advance payment.

Thanks in advance for your responses.