Mobile phone technology was originally intended for making phone calls and not for data transmission. Modern mobile networks are so fast that they can also be used for traditional internet connections at home.
Download rates of up to 1 Gbit/s are available in many places via LTE and with the 5G standard, and even speeds above 1 Gbit/s are no longer a problem – in the long term, data rates should reach up to 10 Gbit/s.