As the Fairphone 4 charger is a standard micro USB, it's not supplied with the phone, in an effort to reduce e-waste.
The Fairphone 4 is compatible with a 'Nano' SIM card (ID-000 format), sized: 15mm x 12mm x 0.76mm. If you have a new SIM card with your Fairphone 3 it will arrive separately to the phone.
This might happen if you are using 2 SIMs in your Fairphone 4. Only one SIM at a time can be set to use 3G or 4G, the other SIM automatically defaults to 2G. Go to Settings>More>Mobile networks. If one of your SIMs has Preferred Network type, it's because the other one is set to 3G or 4G. Change the other one to 2G only to change the service on your preferred card. Don't forget to go to Settings>SIM cards to tell your Fairphone 4 which SIM you want to use for data.
You can download the help guide here:Setting up the internet
We do however use the EE network to carry our service which provides you with excellent signal coverage.
For business customers, we are also able to provide mobile services across Vodafone and O2 networks. Use the Ofcom mobile checker to find out the indoor/outdoor Voice, 3G and 4G coverage in your area.
We can only supply Fairphone 4 handsets to UK customers. If you live outside the UK, you can buy it directly from Fairphone's website.