Have you had a look in places like cash converters,
There's nothing wrong with having a look but somewhere like Cash Converters will happily take every penny that they can and more from someone who isn't good with money. A pound you spend there is a pound that you can't spend somewhee else. You should definitely not ask them for "help" with your finances.
Many of the large supermarkets will sell a basic phone for £5 plus £10 call credit. If you buy a basic phone from CarPhone Warehouse, it's likely to not be locked to any network so you can use the call credit and then put a Lyca, Lebara, Asda, Vectone or whoever you fancy's sim card into it.
The main thing is to live within you means. If you can't afford an iPhone, a Ferrari and a Georgian house on half an acre, then you have to accept that and just get no more than you can afford.