Will an Iphone 5 Locked to EE Network work on Orange or T-Mobile Nano Sims?

I've just bought a Iphone 5 locked to EE network… Will it work on Orange or T-Mobile Nano sim cards without needing to unlock it? Also does anyone know when EE will start doing PAYG Sims?

I think it will I have been googling the same I have a iPhone 4S on t mobile/EE and I'm waiting delivery of a iPhone 5 on orange /EE bought second hand I'm going to get my sim changed to nano as I've been to my local EE store at a charge of £10 they will change it from micro sim to nano then I plan on sell my iPhone 4S to mazuno to get some cash back and keep the iPhone 5 it seems you can use t mobile sims in the new iPhone 5 which is running on EE network locked to EE or ORANGE or T MOBILE only the iPhone 5 let's you as far as I know hope this helps.