the ONLY (and i stress that only.) way to do this is to "unlock" or "root" whatever the phone is. Other wise its impossible to have a tmobile or att on VZW. They will laugh if you try.. If you find a way to unlock the phone then you can call and activate it.
Tmobile or AT&T phones will NOT work with Verizon Wireless. The phones are built to run on different radio signals. Nothing you can do about it... sorry
No one can use T-Mobile or AT&T network based phone with verizon service.Because Verizon is CDMA.AT&T and T-Mobile are GSM networks.But we can switch to other GSM carriers like o2 orange etc..
If you are interested to switch your carrier means,you will need to unlock your phone.You can unlock your phone by network unlock code.If you need an unlock code visit ProUnlocking.com Here you can unlock your phone at low cost.