Will my unlocked Sprint iPhone4s work in the Philippines?

According to Apple's website the iPhone4s frequency operates at the following ranges:

UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz);
GSM/EDGE (850, 900, 1800, 1900 MHz)

http://support.apple.com/...m/kb/SP643

In the Philippines the GSM frequencies operate at:

GSM Frequency Band - 1800 MHz (Single Band)

3G Frequency Band- WCDMA (UMTS) 850Mhz/1900Mhz/2100 MHz
UMTS/3G 1900(uplink)/2100(downlink) (Dual Band)

http://www.mobile31.com/2013/06/Philippines-GSM-Frequency-Band.html

My USA Sprint iPhone 4s has been unlocked so theoretically a SIM card purchased in Manila should allow me to get a Philippines phone number.

Theoretically this should work but I wanted to confirm from actual USA travelers to the Philippines if their unlocked Sprint iPhone 4s worked with a local SIM card.

Added (1). I want to get a SIM card (new phone number) and also a pre-paid calling card. The calling card should allow me to make all the local calls in the Philippines as well as international calls from the Philippines to the USA.

Will this approach work and has anybody done this?

It will cost money if you use it for roaming fees

Well, my Sprint iPhone 4s is unlocked and I'm able to use my Smart sim card on roaming with it. But then, my iPhone is jailbroken.

I'm in PI, coming from USA, with unlocked iPhone 4s. I buy a Globe sim, put it in, and it works ok. Unfortunately it only works "OK". Local phones seem to have much better reception. For some reason when others have 4 bars, I only have 1 or 2. My daughter has similar results with her Samsun S4. Seems all US phones work ok, just not as well. Perfectly ok for a short trip.

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