I buy SIMs for myself but for different projects – which is the best approach?

If you’re running multiple projects for which you are responsible you can put all the SIM cards in one shared bundle package to increase efficiency in use of the data bundle. Should you opt to put all projects in one bundle it is important to note that all SIM cards will be provisioned with same configuration of data speeds and connectivity options. In the melita.io portal you may then label each SIM card according to the project and device it is relevant too. This is a free form field so you may choose the naming approach you prefer.

This is completely up to you. You may want to buy a distinct bundle of SIM card for each project. If each project requires different configurations such as speed type or connectivity it is best to have an order and bundle of SIMs for each project.