I don't understand about mobile data and 2 sim cards

Help Fairphone 2
2

There are four different settings for that:

  1. “Settings” → “Wireless & networks” → “SIM cards” → “Mobile data”: Here do you actually set which SIM card your phone should use for data transfer when not in a Wi-Fi. The other SIM card will not be used.
  2. “Settings” → “Wireless & networks” → “Data usage” → (for each SIM card) “Mobile data”: Here you can enable and disable mobile data usage for each SIM card. That is e. g. important when you have no data plan and data is very expensive. And it will prevent that data is used when setting (1) changes by itself.
  3. “Settings” → “Wireless & networks” → “More” → “Mobile networks” → (SIM card) → “Preferred network type”: That has not really to do with enabling/disabling data usage. Here, you can set which SIM can use 3G/4G; this should normally be set to the data SIM card. Set both SIM cards to 2G only before enabling 3G/4G for the other SIM card.
  4. “Settings” → “Wireless & networks” → “More” → “Mobile networks” → (SIM card) → “Data roaming”: Here you can set if the SIM card should be used for data roaming (e. g. in foreign countries, on ships and planes). You can only completely enable/disable data roaming and not use a “whitelist” with e. g. EU networks.
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