[itry]

1) One thing less to carry around

2) The credit card gives away data that can be used for fraud. Your phone does not have to do that.

[jarek]

> The credit card gives away data that can be used for fraud.

Not with chip and pin or contactless it doesn't

[thrownaway2424]

#1 only makes sense if you ignored the word battery in the question. A phone makes a dreadful credit card. It's huge, it runs out of power, and it throws stack traces at the wrong moment.