Your usage is the best starting point
Check mobile data usage over a similar period in your phone settings. Maps, messages, photos, video and laptop work use different amounts. Review updates and backups in advance and move them to Wi-Fi where possible.
Check hotspot and usage limits
For a laptop or friends, you need permitted tethering. For a plan labelled “unlimited”, look for its fair-use policy and speed-reduction conditions. A package name is not a substitute for detailed terms.
Compare allowance and validity together
A low-priced package with short validity may not cover the whole trip. Check when validity begins, top-up options and what happens after the allowance is exhausted. JustSIM has not published plans yet; verify current prices and terms with the provider.
Official sources
Pages checked: 2026-10-09 · Check current terms before buying.