This is good.
One daughter did university (full four years) “slightly abroad” in Canada. She went to a doctor locally near where the university was and got a prescription for whatever medications she was taking. She did take some evidence that she already had the appropriate prescriptions here in the US.
You might want to make sure that the same medications are available in the UK. My understanding is that psychiatric medications can take some time and trial and error to get right, so it would seem like a very good idea to keep taking the exact same medications when taking a semester abroad.
However, for 90 days just getting the pills here in the US and carrying them with you might be easier (this would be less practical for four years of course).
By the way the prescriptions were less expensive in Canada, and probably will also be less expensive in the UK. A prescription from a local doctor was however necessary.
We did not ever mail any prescription medications. It is possible that some students studying abroad might bring some prescription medications back from Canada to the US just because the cost is so much lower in Canada (allegedly they generally let you bring back a 90 day supply, although obviously I would not have any direct knowledge of this).
The phone plan was not an issue since we can get a plan that works in the US and Canada. However, one of us also went abroad to Spain for approximately a semester, and also went abroad to somewhere in South America at a different point for a semester. In both cases she got a SIM card locally. I do not fully understand the details. I recall her mentioning when she was in Canada that while her plan allowed no additional charge roaming and calls throughout the US and Canada, her phone number was international for her friends. Thus her friends were charged for an international call if they called her. In some cases her friends therefore texted her when they wanted to call, and then my daughter called them.
And I agree that the university’s international student office should be familiar with these issues.
I agree! I am pretty sure that my daughter had a very positive experience studying abroad and expect that your son will too.