Goods for Personal Consumption?

Hi there, I know that there is a personal allowance for goods for personal consumption of GBP390, but I am unsure if this is applicable to me? I travel to UK from Non-EU countries for short-term study (4 months only), as a standard visitor, and my country does not require visa approval. As such, it is normal that short-term visitors/travellers like me are carrying mobile phones, laptops, etc (for study) then I will carry them back home as well. If the personal allowance of GBP390 applies on foreign visitors like me, then I cannot even carry an iPhone 16 because it will exceed the limit and I will have to pay additional tax to enter UK? Do I need to declare any goods in this case? Thank you for clarification. Look forward to hearing back.

Usually if you are bringing goods such as your luggage , clothing and personal possessions into the UK as a visitor these are regarded as a temporary import. The informal customs declaration is performed just by walking through the green channel. This is known as a declaration by any other act https://www.gov.uk/guidance/check-if-you-can-get-import-duty-relief-on-goods-using-temporary-admission#personal-effects-and-goods-for-sports-purposes The £390 personal allowance is for goods purchased outside the UK and will remain in the UK.

Hi,
If you are travelling to the UK temporarily, you can bring in the things you personally use under temporary admissions relief.  
This can be done by oral declaration or crossing the border ‘by any other act’.
Please see below link for more information.
Temporary Admission
Thank you.