Yes postpaid. Yes you are right if you don't want keep the old 1 anymore. I can help you do that for free(only if u bought from me, otherwise i have to charge you rm30 for this service) if u have difficulties to go there.
I have P70 15gb with unlimited call n 7gb youtube for you. Just pay me RM40 every month will do.
Detail: Umobile Postpaid P98 plan. 30gb quota internet. Unlimited Youtube, Astro etc. Unlimited call to all network. Monthly RM68 nett only.
If i m not mistaken, the P70 plan you are paying to others now is rm74.20 per month, which is more expensive than my P98 plan. My P98 plan is RM68 nett. But my P70 plan is just RM40 nett per month! 

Regards all.