Do you remember which ones you had? Before phone companies wanted you to buy a new product every year, Nintendo pioneered the concept of redesign after redesign without actually adding to the product until further iterations. Personally I had the OG grey, Lime green Gameboy Color, See-through purple Gameboy Advance, Red Gameboy SP. Glad They did not have the DS on this list.
Though it is the cell phone companies that confirm your information, send out the cell phone, and control your bank account, this can be a federal government government-subsidized and controlled plan, so the eligibility needs are very related irrespective of where you live and who you choose to obtain your phone from