The phones on offer belong to Samsung's budget Galaxy A-Series range, with the Galaxy A20e and A40 having been announced in April 2019.
The Galaxy A40, with 64GB storage, features a 5.9in AMOLED display with a 25Mp front-facing camera integrated into a teardrop notch. On the back, you get a dual-camera set-up which includes one 5Mp ultra-wide lens and one 16Mp main camera.
You can only pick up the Nintendo Switch Lite bundle when you choose the Galaxy A40 contract plan from O2. The deal includes 12GB of data and unlimited minutes and texts for £29 per month and £25 up front.
For a larger display, there's the Galaxy A10 which offers a 6.2in HD+ screen, along with a 13Mp rear camera and 5Mp front-facing camera. EE is the network to look out for if you're after the free Nintendo Switch Lite with this phone: its plan includes 4GB of data with unlimited minutes and texts for £23 per month and £75 upfront. You can also choose from add-ons like 3 months of BT Sport, 6 months of Apple Music or 6 months of MTV Play.
Meanwhile, the Galaxy A20, like the A40, comes with a 5Mp wide-angle camera and 13Mp main camera on the back, but a 8Mp front-facing camera. It'a smaller 5.8in HD+ screen too.
You can pick up the A20 with the Nintendo Switch Lite from O2: choose from 6GB data per month at £25 per month and a £50 upfront cost, or 12GB data per month for £29 per month and no upfront cost.