How did you spend your weekend? If you’re Apple, the answer is simple, really: selling a whole lot of iPhones. Cupertino this morning announced that iPhone 4S sales have reached four million — quite an impressive number compared to what its predecessor was capable of, a fact no doubt helped by the addition of some carriers, like Verizon and Sprint here in the States. The handset is currently available in the US, Australia, Canada, France, Germany, Japan and the UK, with plenty more countries coming by the end of the year. Whatever happens, Apple has supposedly upped its order from manufacturer Pegatron, increasing its original shipment request by 50 percent, up from 10 million units to 15 million.