SIM card not valid

[#1]

I have  changed from orange pay as you go to giff gaff I have transferred my old number successfully but when I put in my new sim card the message is SIM card not valid I cannot use the phone at the moment I have bought a £10 goody bag

[#2]

Is the phone unlocked? It needs to be unlocked

[#3]

You phone is probably lock to Orange, you need to get it unlocked to use giffgaff.

Most networks lock ALL pay and go phones to prevent you moving, causing them a loss of money where the phone is subsidised

[#4]

make sure your mobile phone is unlocked, or your sim could have a fault with it

[#5]

the phone is not unlocked, try it in another phone

[#6]

It sounds like it needs unlocking, take it to a local phone shop, they will do it for a small fee

[#7]

Did the phone come from orange, in that case only an orange sim will work till get phone unlocked

[#8]

Well phone is locked to orange becaus it says invalid sim .

Invalid sim = phone locked

No service = sim not active

Sim not provisioned = bars on account .