Unfortunate;y no networks will let you port over the weekend.
As others have advised, ring O2 on Monday and they will port your number for Tuesday.
Normally the porting process is fairly seamless however I would advise leaving your new handset turned off on porting day and wait for your old handset to lose service. Then turn your new handset on and make a test call to see if your number has transferred. DONT PANIC if it hasnt as it can take up to 6pm to transfer fully. Every hour or so, just restart your new handset and your number will transfer over.
