Buying an iPhone

From the table (shown below) the cheapest option when buyin an iPhone on contract are as follows :
16GB - £487.00 for the phone and a years contract. (3)
32GB - £611.99 for the phone and a years contract. (O2)
64GB - £701.00 for the phone and a years contract. (T-Mobile)

Network	Contract	Price per month	Minutes	Texts	Internet	Memory	price of phone	Yearly Cost
3	Yes	£       34.00	500	5000	Unlimited	16GB	£         79.00	£        487.00
3	Yes	£       36.00	2000 with 5000 three to three calls	5000	Unlimited	16GB	£         79.00	£        511.00
3	Yes	£       32.00	300	5000	Unlimited	16GB	£      129.00	£        513.00
Orange	Yes	£       41.00	Unlimited	Unlimited	2GB	16GB	£         29.99	£        521.99
3	Yes	£       44.00	1000	5000	Unlimited	16GB	£                -	£        528.00
3	Yes	£       31.00	100	5000	Unlimited	16GB	£      159.00	£        531.00
O2	Yes	£       36.00	Unlimited	Unlimited	1GB	16GB	£         99.99	£        531.99
T-Mobile	Yes	£       36.00	2000	Unlimited	Unlimited	16GB	£      109.00	£        541.00
T-Mobile	Yes	£       41.00	Unlimited	Unlimited	Unlimited	16GB	£         49.00	£        541.00
O2	Yes	£       41.00	Unlimited	Unlimited	1GB	16GB	£         49.99	£        541.99
Orange	Yes	£       36.00	Unlimited	Unlimited	1GB	16GB	£      109.99	£        541.99
3	Yes	£       30.00	100	5000	250MB	16GB	£      189.00	£        549.00
O2	Yes	£       46.00	Unlimited	Unlimited	1GB	16GB	£                -	£        552.00
Orange	Yes	£       46.00	Unlimited	Unlimited	3GB	16GB	£                -	£        552.00
O2	Yes	£       26.00	Unlimited	Unlimited	1GB	16GB	£      249.99	£        561.99
O2	Yes	£       31.00	Unlimited	Unlimited	1GB	16GB	£      199.99	£        571.99
T-Mobile	Yes	£       46.00	Unlimited	Unlimited	Unlimited	16GB	£         29.00	£        581.00
O2	Yes	£       26.00	Unlimited	Unlimited	1GB	32GB	£      299.99	£        611.99
Orange	Yes	£       51.00	Unlimited	Unlimited	Unlimited	16GB	£                -	£        612.00
O2	Yes	£       31.00	Unlimited	Unlimited	1GB	32GB	£      249.99	£        621.99
O2	Yes	£       36.00	Unlimited	Unlimited	1GB	32GB	£      199.99	£        631.99
Orange	Yes	£       41.00	Unlimited	Unlimited	2BG	32GB	£      139.99	£        631.99
T-Mobile	Yes	£       41.00	Unlimited	Unlimited	Unlimited	32GB	£      149.00	£        641.00
O2	Yes	£       41.00	Unlimited	Unlimited	1GB	32GB	£      149.99	£        641.99
Orange	Yes	£       46.00	Unlimited	Unlimited	3GB	32GB	£         89.99	£        641.99
T-Mobile	Yes	£       36.00	2000	Unlimited	Unlimited	32GB	£      219.00	£        651.00
T-Mobile	Yes	£       46.00	Unlimited	Unlimited	Unlimited	32GB	£         99.00	£        651.00
O2	Yes	£       46.00	Unlimited	Unlimited	1GB	32GB	£         99.99	£        651.99
Orange	Yes	£       36.00	Unlimited	Unlimited	1GB	32GB	£      219.99	£        651.99
Orange	Yes	£       51.00	Unlimited	Unlimited	Unlimited	32GB	£         39.99	£        651.99
O2	No	£       10.00	75	500	100MB	16GB	£      549.99	£        669.99
T-Mobile	Yes	£       36.00	2000	Unlimited	Unlimited	64GB	£      269.00	£        701.00
Orange	Yes	£       36.00	Unlimited	Unlimited	1GB	64GB	£      269.99	£        701.99
Orange	Yes	£       41.00	Unlimited	Unlimited	2GB	64GB	£      209.99	£        701.99
T-Mobile	Yes	£       41.00	Unlimited	Unlimited	Unlimited	64GB	£      219.00	£        711.00
O2	Yes	£       26.00	Unlimited	Unlimited	1GB	64GB	£      399.99	£        711.99
O2	Yes	£       31.00	Unlimited	Unlimited	1GB	64GB	£      349.99	£        721.99
O2	Yes	£       46.00	Unlimited	Unlimited	1GB	64GB	£      169.99	£        721.99
O2	Yes	£       36.00	Unlimited	Unlimited	1GB	64GB	£      299.99	£        731.99
Orange	Yes	£       46.00	Unlimited	Unlimited	3GB	64GB	£      179.99	£        731.99
O2	No	£       10.00	75	500	100MB	32GB	£      619.99	£        739.99
T-Mobile	Yes	£       46.00	Unlimited	Unlimited	Unlimited	64GB	£      189.00	£        741.00
O2	Yes	£       41.00	Unlimited	Unlimited	1GB	64GB	£      249.99	£        741.99
Orange	Yes	£       51.00	Unlimited	Unlimited	Unlimited	64GB	£      129.99	£        741.99
T-Mobile	Yes	£       61.00	Unlimited	Unlimited	Unlimited	16GB	£         19.00	£        751.00
T-Mobile	Yes	£       61.00	Unlimited	Unlimited	Unlimited	32GB	£         29.00	£        761.00
O2	No	£       20.00	250	2500	250MB	16GB	£      549.99	£        789.99
O2	No	£       10.00	75	500	100MB	64GB	£      719.99	£        839.99
O2	No	£       20.00	250	2500	250MB	32GB	£      619.99	£        859.99
T-Mobile	Yes	£       61.00	Unlimited	Unlimited	Unlimited	64GB	£      139.00	£        871.00
O2	No	£       20.00	250	2500	250MB	64GB	£      719.99	£        959.99