I've been using a couple different esims providers. First was Airalo which doesn't have BTC or Lightning so wouldn't recomend it now. The other is Bitrefill which I would highly recommend. Had zero issues at all in Türkiye. The only downsides I would say is they are data only and they don't have the option to top them up so when they run out you have to buy a new one. Literally takes two minutes though and is so easy! Would like to try silent link tho!