ITunes asking for valid SIM card during Jailbreak

[saldun22]

Each time when I try to jailbrake any iphone,always have problem with SIM card.
Itunes asking to insert valid SIM card and i must to borroe SIM from sameboddy who have contract.
What is my mistake and how I can avoid that procedure.
Thanks a lot
saldun22

[Simon]

No way to avoid it. you can use one of the jailbreak tools to activate instead but you may have battery and push notification problems doing that.

[saldun22]

Thank You for fast answer,but please check what I find:

Activate iPhone 4, 3GS and 3G Without Original SIM [ Complete How To Video] | Gadgets DNA

[Simon]

Thats a very old method which doesnt work anymore.

[iYeow]

You can restore to a hactivated custom firmware.