contract ending advice please

melly_g

Hi,
My current mobile phone contract ends next month and I would like some advice as to what to do next.
I'm currently with t mobile on a flext 35 12 month contract.
This gives me £120 a month to spend on texts and calls.
I have felt that this hasn't been enough for my needs.
I have a sony w88oi at the moment which i would be happy to keep.
Shall i go for a sim only plan like solo or get a contract with a phone and then sell the phone ?
Also O2 are doing deals which include free o2 to o2 calls and The majority of my calls are to an o2 number.
Do I try and get t mobile to give me a good deal or change to o2?
Or are there any other offers or deals I should consider?
Thanks in advance for your help