@jt123
From what you have described of your usage you would likely be better of switching to a new plan as it offers more flexibility to move between plans and the difference in data speeds would be barely noticeable for your needs only affecting the loading of video content on Instagram for example by being a little bit slower rather than instantaneous.
You would probably save a little bit of usage as the i mage quality will automatically be downgraded to a lower resolution (that is imperceptible on a phone's screen) but depending on the amount you use apps with a lot of video content or high quality images will add up to some noticeable data usage savings that may allow 1gb per 30 days to be enough.
You have been given some great advice by @Anonymous , @Dunkman and @hairbag1 on changing plans with your rewards to follow your account no matter what plan you choose. I would suggest you start with the $25/1gb plan. Employ all of your data savings tools available to you in your phone (turn off background data, set data warning and limiter etc....)and you will probably stay within 1gb per 30 days. You could purchase the $15/1gb data add on to supplement your usage when you need just a little more to get thru your cycle or just wait it out til December in the hope of "more the merrier" campaign free add on goodies.
After your first 25 days of your new plan and you feel you really want more data the you are free to upgrade to the $35/3gb or the $40/5gb plans. Flexibility to change plans as your needs change is a huge advantage over your 90 day plan currently. BTW....you will still see LTE on your phone once you switch as pm only uses 3G for calling....if you force your phone to the 3G network be cause you want a higher data speed ( avg. 12mbps to 20mbps+) for a particular task then the LTE icon will disappear and the 3G icon will show up.
Be sure to schedule your plan change on next renewal....you can cancel this change at any time up until 11:59:59pm et the day before renewal.
