So, let's do a little math here. Say you just want a single mobile line. Verizon charges $80 per month (plus taxes and fees) for its Unlimited Plus plan. Spectrum Mobile charges $50 per month for a similar plan—and that's with the $10 fee for discontinuing Spectrum Internet service. Both have discounts when you bundle multiple lines, but we see why Spectrum claims it's cheaper than Verizon. The only caveat we see is the requirement to have Spectrum Internet before you sign up for Spectrum Mobile. Verizon doesn't do that. Plus, Spectrum bundles internet, mobile, and its gateway into an affordable Spectrum One deal, which saves you money in the first year of service—and that's only if you have Auto Pay enabled.