What is the quickest way to get a phone number and internet?

Get a prepaid SIM from one of the three operators on your first day. The card must be registered in your name, which is a legal requirement, so bring your passport; anonymous cards get switched off. Stay on prepaid for the first few weeks until your address and residence status with the foreigner's personal number are sorted, because contracts and fixed-line internet require identification and often a deposit without settled status. Test coverage at your own address before signing: in the seasonal resorts the networks are heavily loaded in summer. Ask the building manager which provider is already wired into the building, which saves connection costs.