Simply put, my charge will be the amount of money I save you during your first 3 months after switching. Therefore there is NO net cost to you, and after 3 months you keep all of the savings. My fee can be paid in 3 monthly installments or you may choose to pay the entire fee up front for a 10% discount.
For example, let’s say your new plans save you $50 per month on your mobile phone service and $30 per month on Internet/Wifi service, for a total savings of $80 per month. You would owe 3 monthly payments of $80 each, for a total of $240. But since you would have been paying that extra $80 every month anyway, there is effectively no out-of-pocket cost1. Or you can pay $216 up front ($240 - 10% discount). After the first 3 months, all of the ongoing savings are yours to keep! So in this example you would save 9 X $80 = $720 the first year and 12 x $80 = $960 every year after that!
1Note that some carriers such as Mint Mobile require you to pay for 3 months in advance or will offer you a better deal if you pay a year in advance. Some providers may also charge an installation fee or new customer fee, though we can often help you negotiate to get these fees waived.