The short answer
Use this guide after a competent local authority has arrested or detained you or a travel companion abroad. The authority and local law control custody; this page cannot state universal rights, deadlines, release conditions or legal strategy. Do not resist, flee, conceal or delete material, sign what you do not understand, or rely on a stranger claiming influence. Ask how to obtain an interpreter, independent legal advice and notification of the correct embassy or consulate. A consulate may explain the local system or help identify lawyers when its rules allow, but it cannot cancel proceedings, order release, pay ordinary costs or act as counsel. Ordinary mobile data belongs only after urgent, legal and custody channels work without it.
Request understanding before making document decisions
Tell the authority which language you understand and ask what official interpretation or translation process applies. Do not pretend to understand a question, caution, inventory, statement, consent, waiver, charge or release condition. Request time to read and qualified legal advice where available under the applicable procedure; ask for a copy or reference for anything signed or refused when permitted. This guide does not tell anyone to answer, remain silent, consent, refuse, sign or appeal because those choices depend on local law and case-specific advice. Do not use an unverified translation app as the sole basis for a legal decision, and never send a passport image, case document, payment credential or one-time code to a stranger offering release.
Use independently verified consular and lawyer routes
Ask the authority how consular notification or contact works and identify the embassy or consulate by the traveller's nationality, not by language or destination alone. Open the official government directory independently. European Commission guidance says an embassy may, once contacted, provide information about the local legal system or help find a lawyer in arrest or detention cases; scope and access still depend on nationality, representation and local rules. An unrepresented EU citizen outside the EU may seek another EU state's consular help under the stated conditions. Ask what staff can communicate, visit or relay, but do not claim they can secure release, provide privileged representation, override the court, investigate evidence or fund bail, fines, lawyers, accommodation or tickets.
Protect the custody record and rebuild every affected responsibility
Keep one private chronology of authority, location, permitted contacts, interpreter and lawyer requests, documents, property inventory, medication, deadlines, court or transfer information and the source of each update. A companion should share sensitive facts only with the detained person, authorized lawyer, responsible authority, consular post or approved family contact. Do not circulate accusations, recordings, live locations or case papers online. Verify who controls passport, phone, baggage, rental vehicle and accommodation property. Recheck children, dependants, medicines, pets, work, onward transport, visas and every country now affected. Cancel or change bookings only through verified providers and only when authorized; an absent traveller, confiscated phone or missed departure does not itself prove a refund, insurance outcome or permission to cross a border.
Measure only a non-critical data remainder
First secure a route that works without consumer internet: authority contact, lawyer, interpreter, consular channel, urgent care, required conventional calls and one trusted companion plan. Then list modest permitted tasks on an available device, such as opening an official directory, reading a provider-approved itinerary or sending an authorized ordinary message. Subtract working roaming, trusted Wi-Fi, staff assistance and offline records. Buy only if phone possession and use are permitted, every country is listed, activation and validity fit the changed trip, and the unlocked device is compatible. Stop if the need is emergency help, legal advice, calls, SMS, a local number, identity, payment, release, evidence handling, secure confidential communication or guaranteed signal. CheapESIM supplies data, not legal or consular services.