[Samsung Galaxy Nexus] ivoniko:
Posting my experience with switching from postpaid to the $30 prepaid plan. It was quite the nightmare but maybe it will help others.

Tuesday - all day trying to activate the sim I bought online from T-Mobile and although I tried with 4 different phones IMEI it didn't work.

Wednesday - I tried to activate the plan and worked right away from the first time.

Thursday - I call T-Mobile to port my number to my new prepaid account. After a lot of explaining and talking back and forth to a manager they tell me that it is not possible but what they can do is just switch my current postpaid plan and sim to the prepaid one. I thought great, that was easy. A few hours later receive massages my plan is switched. Then I log in to my.t-mobile.com account and I have to register, enter new password etc. I think everything's perfect. Although my account looks like nothing has changedDecide to wait until next morning.

Friday - I login to my.t-mobile.com account it still looks like my old unlimited postpaid plan. I call T-Mobile, they tell me that the request for the change didn't work for some reason. After a lot of explaining again and talking to a manager the representative tells me that this manager knows really well they are doing and everything will be done and over in 24 hours.

Saturday - Last day of my postpaid billing cycle. After checking my online account all night and morning and seeing that nothing has changed I call T-Mobile. 30minutes back and forth conversation with the representative while she talked to a manager a few times at the end of which she takes all my info, she says that my plan will be changed to prepaid, it will take 24 hours and once it is changed I will have to go to Walmart to get a code because it is a Walmart only plan. At the end of this I'm completely mad and fuming and tell her that I've had it with them and I'm moving to AT&T. She transfers me to Retention Team. I explain everything again and she tells that it is being taken care of, the plan is changed, I just have to call prepaid department and add funds and that's it. She transfers me to prepaid refill department, they say something incomprehensible - probably these guys are somewhere in India and connection is quite bad - and they transfer me to another prepaid department. I can here the guy this time but he says that he is not refill and he transfers me back to refill. In refill this time I understand them and they tell me that my account is not prepaid it is still postpaid and transfer me back again to postpaid department. This time in postpaid the guy that answers seems like he knows what he is taking about and after a lot of explaining he says that he will have to change my account to just any prepaid first and then I will be able to choose that one I want. I tell him that I want this done as soon as possible since my billing cycle starts the following day. I hang up and after a few hours I get a message and after I login to t-mobile I see that it finally was changed to prepaid. The problem is that there is no $30 unlimited 5GB Data 100 mintes plan to choose from at this point. I'm already looking at other options and almost decided to go Straight Talk for a month and then port back to T-Mobile but decide to try one last time. It is already Saturday evening. I call prepaid department and after a lot of explaining and saying that I have 2 prepaid accounts but I want to use my old number with my new $30 Unlimited Text/Data/100 mins Walmart the representative calls a manager and after she's back on the line, confirms exactly what I wanted which I reconfirm and says that it will be done in 10-20 minutes. Finally after 15 minutes i receive a message, login to my T-Mobile and see HEAVEN - it is the actual $30 Unlimited plan for real.

Probably the most important things I learned are the following:

- In prepaid department they know much better how to help you with this plan and porting the number.

- When they ask you for all details when switching plans make sure they get everything correct , birthdate is correct, they said that if there is 1 number not correct the request doesn't go through.

- Always insist on porting postpaid number to new already activate prepaid account, they tricked me into thinking they will switch my plan/sim directly takes many hours, days and may never even happen.

-Just port your number to Straight Talk for a month and then back to the Walmart plan and save yourself the headache. Hell you might even like the AT&T reception better and stay with ST