Can I just roam with my home carrier in China?

Why it usually works: on many plans roaming data is “home-routed” — it exits to the internet through your own carrier's network, outside the mainland filtering — which is why press and firsthand reports say Google and WhatsApp work without a VPN. But roaming can also be set up with local breakout, and carriers can change routing per plan or service. Treat the reports as likely, not guaranteed, and ask your carrier about your plan.

What no carrier says: AT&T's and Verizon's China pages give prices and coverage and say nothing about whether blocked apps work; we could not read T-Mobile's, EE's or Vodafone's China pages directly. The one dissenting claim — an eSIM vendor's blog saying T-Mobile roaming “doesn't bypass these blocks” — is from a company selling an alternative, with no test data.

Cost is the clearer reason to think twice. From the carriers' own pages: AT&T International Day Pass US$12 a day (US$6 per additional line, charged only on days used); Verizon TravelPass US$12 a day in China. T-Mobile, EE and Vodafone rates and throttles vary by plan — read the current page for yours rather than a figure from a blog.

Do the arithmetic for your trip: days you would actually use data × the daily rate, against a travel eSIM priced by data volume. For most two-week trips the roaming total is several times an eSIM. Roaming does keep your home number live for calls and SMS codes, which is why the usual pattern is: home line on with data roaming off (check what receiving SMS and calls costs on roaming), travel eSIM for data.

If you do roam, check the carrier's China entry before you fly, set a data cap, and expect throttling after any bundled allowance is used.