The Lumia 435 is not a fantastic handset for techies, it's unsuitable for myself as anything other than an emergency backup or satnav. Largely because the far fewer apps it does have, are not as good as the Android or iOS equivalents.
It's a hell of a bargain for £15 though. It's frankly still reasonable at £35.
However for my mum, it's a perfect "my first smartphone". Not least because the hideous safety orange colour scheme makes it harder to lose.
I purchased my own handset from P4U, SIM free, and it's on a PAYG network. It was cheaper than buying it on Amazon, and I could pick it up instantly.
Amazon deliveries are really hit and miss here at the moment. Months of free Prime because they've repeatedly fucked up time-sensitive deliveries.