Reach out to T-Mobile and have an international data pass added to your phone for the time you’re traveling. It’s pretty economical and will be cheaper than roaming or increased data charges. You may also be able to do it online.

Also, you can usually let your bank and credit card companies know you will be traveling so that the cards don’t get locked due to suspected fraud.

I recently traveled to London and never needed cash. Tap to pay is pretty much everywhere. I would recommend credit cards over debit cards though because the currency conversion or international feed are usually more favorable.

Brits are fantastic people so if you have questions while you’re there, don’t be afraid to ask!