No because the G1 only supports GSM SIM cards and boostmobile uses IDEN SIM cards.
Depends on if the phone is locked to a certain provider or not.
No, the T-Mobile sim cards don't fit in AT&T phones and AT&T phone sim cards dont fit in T-Mobile phone. And when I say fit they fit in the slot they just dont read the information from different users.
You can't get a T Mobile service on a phone that's not T Mobile unless you get it unlocked. Once the phone is unlocked, you can use your T Mobile SIM card on it or any other GSM SIM cards worldwide.
Virgin Mobile uses CDMA, so their phones do not take SIM cards.
No
If it's an unlocked phone and supports the same frequencies as the carrier on your sim card. Then yes, it depends on the model of your phone.
Yes, a Tesco Mobile SIM can work in an EE phone as long as the phone is unlocked. Tesco Mobile operates on the O2 network, but most unlocked phones, including those from EE, can accept SIM cards from different carriers. Just ensure the phone is compatible with the network frequencies used by Tesco Mobile.
if the phone is a prepaid phone, no. if it came on a plan, or bought outright, yes
There is no such thing as a CDMA SIM card, since CDMA phones do not use SIM cards.
Yes, Virgin Mobile now uses the sim cards on new phones.
ALL mobile phones use a SIM card ! It's how the network identifies the individual phone.