The smartphone will be replaced by an "only-phone"

My Galaxy SII well and good, but the whole Schnick-Schnack only costs additional money and, potentially dangerous by data theft. As a user of a prepaid card I wondered for a long time that my credit card has been less and less, even though I was offline for weeks often, but merely made over Wi-Fi connection to update many apps. However, were charged repeatedly without any apparent cost info. That's with this classic simple mobile by: no apps, no network connection, just telephony, and - lo and behold - the credit is fully controllable and accurate to decreasing consumed by comprehensible conversation units.
The smartphone I use only as Navi, Camera, and numerous other features that make the installed apps, but without smart card, so fully offline. There is very useful, and only that.

This small clamshell phone is very handy, consumes little battery power (standby about 500 hours talk time 150 hours), disappears into the smallest shirt or trouser pocket; Call quality is acceptable, features enough.