Ah yes, you have a pocket computer to tell you everything. But your pocket computer, it may not work here.
Arriving at the airport, you should have your travel instructions printed out on paper. In case your phone died inexplicably and your charger doesn’t work, inexplicably, or you lost the adaptor for the charger. Or your roaming plan isn’t enabled for some reason. Or the wifi at the airport isn’t working.
Networks and sim cards and all that are weird. There is plentiful free and unsecured wifi, but you will need a charged phone to hunt for it. Regarding power, it might be easier to order the wall plug charger or power supply for your computer/devices from Amazon in the US and bring it with you. Things like flat irons, ironing irons, and hair dryers you can buy cheaply at Rossman, the sundries/drugstore. Like ten euros and made to a far more robust standard than US ones.
Your laptop, if it’s fairly new, will work fine if you have an adaptor or power supply with an EU plug.
Modern computers are made to operate dual-current, as are modern phones. Check to be sure though, cause that German current in the wall will fry your stuff within an hour. As in, you may plug something in, see it turn on, think everything is fine, and find it burned out an hour later. Like my awesome new Halloween lights 🙁
For any important or valuable electrical thing that’s *not* a modern phone/computer, you’ll need a Step-Up/Step-Down transformer. Again, though they are heavy, you might want to buy one to bring along. You can buy one here at a store like MediaMarkt, but what if you arrive on some German holiday weekend when everything’s closed for five days? Or on a Sunday?
Stores aren’t open on Sunday, fool! And you can order it from Amazon.de, but they only deliver things sometimes. (See my post on Things I Hate About Germany for more on the unreliable postal systems).
Prescriptions for medicine: don’t bother to bring them!
Your US health insurance is worthless here. And you may not yet have secured one of the various European or UK insurances that are currently valid for Germany (constantly in flux, check Facebook). Those are really crisis coverage anyway.
So if you don’t have German health insurance, you can go to a doctor and for a like 35 euro visit they will write you what is called a “private” prescription. This is a prescription you can take to any Apoteke and use to get your medicine, which will be ridiculously, hilariously cheap even without insurance. You just hand the pharmacist your prescription and they hand you the box of meds- no waiting to “fill” it or count pills.