Can i add on another line to my tmobile plan if?

Ok so I want to buy my son an iPhone 5s on Saturday December 6 2014. But my phone bill is the next DAY December 7 2014 Sunday. I don't want to add on the line and get charged for it the next day on my bill. So I wanted to know if I can go to the store on the 6th and pay my phone bill early and then add on the line. So that way the bill won't go up right then because I will have already payed the bill. So the bill will go up for the next time. Is this possible. Can I pay my bill before hand and then add on a line to my plan? BTW the phone is $0 down so I won't have to pay anything in the stores.

Ask your carrier for the most accurate answer.

If it were me, I'd add a second line when my billing cycle closed. That way any new charges will be on the NEW billing cycle. But for me it really would not make any difference, if I had to pay the extra, say $100 this bill or next bill.

  • Would It Cost More To put an extra line on an AT&T unlimited family plan? Well we have been with AT&T for a while, and we still have the unlimited data, unlimited text and unlimited call. So I was wondering if it would cost a lot more to add one an extra line. The plan only has 2 GoPhones and 2 SmartPhones on it. So could one of the GoPhones be replaces my an iPhone? ( GoPhones are $10 a month )
  • Will tmobile let me add a different phone to our line? Sadly, I just finished paying my iPhone 5s and it got water damage. I don't have insurance anymore. I doubt they ll be able to do anything with my damaged phone =l so I was wondering if I can buy an used iPhone from the same carrier and just replace it? Will everything be the same again?
  • Verizon iPhone dead, but another line is eligible for an upgrade, contract options? In our share everything Verizon plan, we had 1 IPhone contract activated in October 2012, and 3 in March 2013. My iPhone is broken due to water damage- it's 2 year contract is over this march.Is it possible to purchase a $200 phone through the October contract (while keeping our #s) or do I have to pay full price for an upgrade or wait until march to get a deal on a phone?
  • Is it cheaper to get a new iPhone on a plan or buy it unlocked and add a cheap plan? I can either buy the phone for $250 and pay a monthly $80 plan with data for 2 years or purchase the unlocked phone $800 and pay $30 - $50 a month - I might not get data but it wouldn't be a big deal to me, I'm just trying to find a deal thats not ridiculously expensive cause I can't really afford too too much right now. Which would be better?