14% of mobile phones sold in 2008 were smartphones.

Cell Phones	Ver- izon	T-Mobile	Cin- gular	Blue- tooth	Other	Camera	Data	Screen	ZDNet rating
LG VX8000	X					1.3 M	EV-DO	176x220
LG VX9800	X					1.3 M	EV-DO	320x256
Samsung_SCH-i730	x			x	WiFi	1.3 M	EV-DO	240x320
Samsung SCH-a790						0.3 M		176x220
Samsung ZX20				x		1.3 M	HSDPA	176x220
Mot RAZR V3		x		X		0.3 M	GPRS	176x220	7.0
Mot V330/360		x		X		0.3 M	GPRS, EDGE 4	176x220	7.0
BlackBerry 7105t		x		X				240x260
Nokia N90		x	x	x		2M	y
Nokia 8801		x	x	x		0.5M	GPRS, EDGE	208x208
Samsung SGH p735		x				1.3 M
Samsung SGH-T809				2		1.2 M	GPRS, EDGE 10	320x240
Nokia 6230			x	x
Samsung SCH-a650	X
Sony-Ericsson K700i		x		x	FM	y	GPRS	176x220	7.6
BlackBerry 6230								160x100 mono
BlackBerry 7100				x			GPRS	240x260 color
BlackBerry 7250				x			CDMA 2000	240x160 color
BlackBerry 7290				x			GPRS	240x160 color
BlackBerry 8700c				x			EDGE, GPRS	320x240

Another option is to get a used phone on ebay.
With a GSM phone (AT&T or T-Mobile) you can just replace the SIM card with the one from your old phone (It can be from a different manufacturer). You have to stick to a phone from the same carrier (AT&T or T-Mobile) unless you get a unlocked phone which will work with either.
In 2009 I got a 3 1/2 year old Blackberry 8700 (2.5G) phone for $44. The same unlocked phone would cost about twice as much.
You can use pre-paid SIM with you and pop it into your phone in case there was ever a time when you wanted to have phone service but not be reachable by your usual number.

The easiest way to make sure everyone is compatible is to call the wireless provider with the phone's electronic serial number (ESN). It is on the back of the phone (maybe behind the battery).

CDMA phones (Verizon, Sprint) in the US do NOT have a similar capability. CDMA phones in China and S. Korea use a R-UIM card which does have this capability and is compatible with SIM cards.

AT&T phones with QWERTY Keyboards
Sony Ericsson Software