When choosing an IP phone service, you need to look into your monthly budget for such a service. Determining whether or not you can afford a digital phone service in the first place is important before you can start applying for an internet phone call service. When choosing an IP phone service, you need to look into your monthly budget for such a service. Determining whether or not you can afford a digital phone service in the first place is important before you can start applying for an internet phone call service.