Hi, sorry for writing in English, my Czech isn't good enough to explain myself. Starting late last year, whenever I travel outside the Czech Republic, my Vodafone SIM's reception goes down to zero. I noticed it first in Hungary, and now I'm in Bosnia and there's no reception. I've had this SIM for basically a decade and never had this problem. As well, my wife has a Vodafone SIM and hers is just fine. I'm really not sure why this is happening, but it's making it impossible to use multi-factor authentication in some instances, including into my own Vodafone account. Does anyone have an idea how I can fix this? Thank you!

Poznámka moderátora: dávám sem český překlad, protože jsem si všiml že na dotazy v jiných jazycích se tady téměř nereaguje:

Ahoj, omlouvám se, že píšu anglicky, moje čeština není dost dobrá na to, abych to vysvětlil. Od konce minulého roku, kdykoliv vyjedu mimo ČR, tak mi na SIM kartě Vodafone klesne příjem na nulu. Nejdřív jsem si toho všiml v Maďarsku a teď jsem v Bosně a tam není signál žádný. Tuto SIM mám v podstatě deset let a nikdy jsem tento problém neměl. Stejně tak moje žena má SIM kartu Vodafone a její je v pořádku. Opravdu si nejsem jistý, proč se to děje, ale v některých případech to znemožňuje použití vícefaktorového ověřování, a to i do mého vlastního účtu Vodafone. Má někdo nápad, jak to mohu napravit? Děkuji!

hi, make sure your network selection is set to automatic, so your phone can switch to foreign carriers

on ios it's under settings > cellular > (your sim if you have multiple of them) > network selection
i currently don't have an android phone on me so i can't check how to set it there, but it should be in somewhat similar place

if that doesn't help, you can enable wifi calling, vodafone supports wifi calling in roaming so if you have it enabled and are connected to a wifi, you should be able to make/receive calls and sms

@SaintFestias Try your SIM in different phone.

Are you sure if nothing has changed on your SIM for roaming (do you have roaming allowed for SIM)? If is roaming service for SIM (in you Vodafone account) enabled and in phone also, try search and connect to network manually. Sometime could help phone restart.

If you are still without connection, ask Vodafone to check your SIM card or restart your services.

@helpguy Hello, Please check the roaming settings on your phone as well as for your phone number in My Vodafone. When abroad, you are not using your home network but roaming, which means connecting to a local roaming partner's network. You can also check some common situations we describe here: https://www.vodafone.cz/pece/reseni-technickych-problemu/roaming-a-volani-do-zahranici/nefunkcni-roaming/. Alternatively, you can send us more details via https://tam.je/enforum and we’ll be happy to check your SIM card.