Minimizing apps in nokia n70

For the TI-89 Family, TI-92 Family, and Voyage 200:

1. Try a new set of batteries (including the backup battery).
2. Adjust the contrast by pressing and releasing the Diamond Key key followed by pressing and releasing the [+] key; repeat as necessary. To adjust or lighten the display, use the [-] key.
3. Users of the TI-89 Titanium or Voyage 200 should see the following case before performing the following reset procedure to prevent the loss of valuable Apps.
   On the TI-92 family or Voyage 200, hold the [2nd] key and the [hand] key, then press and release the [on] key. On the TI-89 family, press and hold the [2nd] key, left arrow, and right arrow; then press and release the [on] key. This should reinitialize the operating system, in which you should see a progress bar filling on the screen.
4. Remove one of the AAA or AA batteries. Press and hold the [APPS] key, and while holding the [APPS] key, replace the battery and turn the unit on. TI-89, 92 Plus, or Voyage 200 users should see "Press I to install code...", and should press the [9] key. The calculator should then say, "Waiting to receive...". TI-89 Titanium users should see "Waiting to receive..." or "Waiting to received OS...".

make sure you got enough memory available on both phones internal and micro sd card. also try to delete suff from internal memory
move the sms contacts to memory card... along with apps..
Close any active app (Press and hold menu key to see open apps)
if any of the above doesnt fix, then you need to format your phone..
1. Switch off the phone.
2. Hold down the following three buttons: Green (call answer button, * button, and '3? button.
3. While holding these buttons, press the power button and switch on the phone.

In order to minimize applications on Nokia N70, you cant press the red key.
You should press menu key twice and try minimizing it.