As mentioned, your friend's income isn't relevant since you don't need any particular income to sponsor your spouse. You don't even need to have a job. But he/she will need to submit proof of their relationship (cards, letters, email, photos etc.). The phone marriage needs to be legal in the country where it took place. And given that it was a phone marriage, they may scrutinize the file more closely to ensure that it is a genuine relationship and not one entered into to facilitate immigration into the country. Good luck.