You can only change your plan or pack once every 30 days, and it must be within EE’s current plan range.
The data allowance of the plan you’re transferring to must be the same or higher than your current plan
2. o2 ( TRANSFER WITHIN SAME NETWORK)
To transfer any number within different O2 network deals and offers, just fill out the website’s form for keep my number. Follow the step-by-step instructions below on how you can move your mobile number from Pay As You Go to any Pay Monthly plan or reverse.
O2 Refresh: You can only move to PAYG once your Device Plan payment is settled.
Not on O2 Refresh: If you’re in a minimum contract term, you might need to pay a termination charge. Get in touch with O2’s Customer Services.
O2 SIM Swap
Before the SIM swap first do not take out your old SIM. As O2 may issue security code in the old number.Take note of the 13-digit SSN or Sim Serial Number that starts at 00. You can easily find it on the back of your sim card.
To be able to transfer your cell phone number to your new SIM: