Wayata tana buƙatar caji; baturin ya kusa ƙarewa.

Both exist, but they’re different constructions:

• waya + -ta → wayata = my phone (a common “attached” possessive form)
• wayar tawa = literally the phone of mine (more emphatic/contrastive: my phone, not someone else’s)

So Wayata is the straightforward, everyday way to say my phone.

-ta is the 1st-person singular possessive suffix meaning my/mine attached to the noun:

• waya = phone
• wayata = my phone

You’ll see similar patterns with other nouns (the exact linking sound can change depending on the noun).

Because waya (phone) is treated as grammatically feminine in Hausa, so the subject pronoun agrees:

• tana = she/it (feminine) in the imperfective (ongoing/habitual) sense
• yana = he/it (masculine)

Even though a phone isn’t biologically female, Hausa nouns have grammatical gender, and agreement follows that.