T-Mobile launched its 5 Gig fiber plan on November 3 in select U.S. locations. The company announced $90 a month for 5 Gig and $70 for 2 Gig, both with AutoPay and before taxes and fees. That puts the advertised difference at $20 a month, or $240 over 12 months before taxes, fees and temporary offers. Start by checking whether your address has both options.
Compare the regular bill first
Ask for an address-specific quote for each tier. Write down the recurring service price, AutoPay requirements, taxes and fees, and the month when any bill credits end. List a prepaid card separately from recurring discounts: it may reduce what you spend overall, but it does not lower the monthly service price. Use the post-promotion bills to decide whether the upgrade fits your budget.
Read the 10-year guarantee as a service-price promise
T-Mobile describes the 5 Gig guarantee as applying to the price of internet data. Its announcement excludes taxes and fees, voluntary equipment or speed upgrades, some limited-time promotions, per-use charges and third-party services. If you are comparing offers, ask the provider which line item is guaranteed and what happens if you later change plans.
Find what is actually slowing you down
A 5 Gig plan gives the household more internet capacity, but a wired computer connected through a 1 Gbps port cannot use the full 5 Gbps by itself. Wi-Fi conditions, the router, other network equipment and the remote server can also limit what you see. Several devices can still benefit from sharing more capacity even if no single device uses the full connection.
For example, suppose a desktop backs up large files each evening while two people make video calls. If the calls stall only in a room with weak Wi-Fi, check coverage first. If calls also stall over Ethernet while large transfers keep the current connection busy, compare whether a faster tier or scheduling the backup for later solves the problem. Check the equipment and quoted price before upgrading.