Ring 191 and choose the thinking of leaving option to get through to the Retentions Department @MinkieMoo2021 and they'll go through your options in regards to your allowances and tariff costs.
They'll go through the new evo plans which does involve a new credit check.
One of those may suffice.
If your phone is OK to keep using then consider one of the various terms of a sim only contract, or even consider payg.
Or look at options via Carphone Warehouse where you can upgrade with them or take out a new contract and then can arrange to transfer your mobile number to the new contract if you want to retain your number.
Current Phone >
Samsung Galaxy s²³ Ultra 512gb Phantom Black.
