Your phone may or may not count. If it's paid on a debit card like Giff Gaff or similar it won't be reported, but if it goes out by DD it might.
Different lenders view a lack of credit use in different ways and obviously you may not want or need to borrow money, but it's better to be able to borrow money but not need to, than need to and be unable to, or find it more expensive than it has to be.
I don't understand why people seem so against using a credit card for their normal spending and paying off the balance in full every month by DD. It has so many advantages even if you don't need to borrow money.
Purchase protection if your supplier goes bust or fails to deliver or goods/services are deficient in some way
Cashback/points
Cheaper and easier to hire a car
Simpler finances - you don't have dozens of transactions coming out of your current account each month
Protection against loss of service/hacking. If your main account is hacked or the service goes down, you could be completely stuck and have no way of spending money. Having a back up means that you can still function financially and your direct debits will go out as normal.
Cashflow management for free if you need to make a large purchase, an overdraft costs money but you can spread the cost over a few weeks with a credit card.
Plus probably more.